Apparatus and methods for distributing print jobs
Granted: December 16, 2008
Patent Number:
7466441
Apparatus and methods for distributing print jobs. A print job is generated at an application node of a network, and has associated therewith print parameters. The print job is routed to a distribution node on the network. The parameters are then parsed from the generated print job and the print job parameterized with predetermined metrics that are a function of at least one of the parsed parameters. The parameterized print job is then routed to a destination device on a destination node…
Methods and apparatus for secure printing
Granted: December 9, 2008
Patent Number:
7463374
Systems and methods are provided for securely communicating a print job to a printer, the systems and methods pausing the print job in a print queue on a client computer, obtaining first authentication information regarding a user at the client computer, obtaining second authentication information regarding a user at a release station adjacent the printer, communicating the second authentication information from the release station to the client computer, and releasing the print job from…
Apparatus and methods for printing a print job over a network
Granted: December 2, 2008
Patent Number:
7460265
The present invention relates to methods and apparatus for printing print jobs over a communications network. In particular, the present invention enables a user to obtain print jobs at a location which may be unspecified, and which may be remote from the source of the print job. A spooling server is used to store a print job received via the network from a print job source. A printer polling device, which may be used at a location remote from the client device, is capable of polling the…
Methods and apparatus for data compression with a hybrid context
Granted: December 2, 2008
Patent Number:
7460721
A plurality of compression schemes are provided that achieve improved compression ratios. A first embodiment provides for compression of each pixel by one of a plurality of different entropy-based compression schemes based upon a probability cost analysis. A second embodiment provides for compression of each pixel based on a hybrid context formed using a plurality of compression schemes for improved probability determination, and thus improved entropy encoding. In embodiments of the…
Method and apparatus for automatically managing capabilities in a virtual printer group
Granted: December 2, 2008
Patent Number:
7461377
A method for dynamically managing printers comprises a mechanism for printing from a network of printers that belong to a virtual printer group to meet the user's request for printing. The invention does this by requesting an options and capabilities file from each printer and then generating a virtual printer group, such that when a user wants to print a file, the invention looks for the best suited printer for the user and sends a file to that printer for printing. The invention has…
Digital pulse width modulator for use in electrostatic printing mechanisms
Granted: November 18, 2008
Patent Number:
7453596
A fully digital pulse width modulator substantially doubles resolution in a laser printer by outputting data to the laser on both the rising and falling edges of the clock cycle. A counter and the clock itself are used to select input to a multiplexer, and consequently, the data output to the laser from the multiplexer. A data selector code, generated by concatenating the binary value of the counter and the inverted clock bitwise, selects which of the 16 bits representing a pixel to…
Methods and apparatus for calibrating a digital color imaging device that uses multi-hue colorants
Granted: October 7, 2008
Patent Number:
7433078
Methods and apparatus are provided for calibrating a digital color imaging device to a printing press by determining a total colorant limit, per-channel colorant limits, and channel linearization tables using calorimetric and/or spectrophotometric techniques. In addition, for digital color imaging devices that use multi-hue colorants, methods and apparatus are provided for determining distribution functions for the multi-hue colorants as a function of input values.
Methods and apparatus for colorimetrically characterizing color deviation in color imaging devices
Granted: September 16, 2008
Patent Number:
7426033
Methods and apparatus are provided that print a set of similar color patches using a color output device, determine colorimetric values for each color patch, calculate a standard deviation value for each of the colorimetric values, and calculate a numerical value that is a function of the standard deviation values and that represents the colorimetric deviation of the set.
Apparatus and methods for digital image compression
Granted: July 8, 2008
Patent Number:
7397961
Methods and systems for compression of digital images (still or motion sequences) are provided wherein predetermined criteria may be used to identify a plurality of areas of interest in the image, and each area of interest is encoded with a corresponding quality level (Q-factor). In particular, the predetermined criteria may be derived from measurements of where a viewing audience is focusing their gaze (area of interest). In addition, the predetermined criteria may be used to create…
Method and device for proofing raster print data while maintaining the raster information
Granted: July 8, 2008
Patent Number:
7397583
The screened printing data are subjected to a filtering method, the raster information being maintained. Intermediate tonal values are produced by the filtering method, using the binary tonal values, the intermediate tonal values being configured in such a way that, by means of a color space transformation, transformed tonal values and/or intermediate tonal values can be formed which represent a true-to-color proof.
Apparatus and methods for water-based ink printing
Granted: July 8, 2008
Patent Number:
7396119
A printer that includes at least one printhead mounted to a carriage of a printing system, and a secondary ink container mounted to the carriage and which holds an ink and is in fluid communication with the at least one printhead. A pressure source in fluid communication with the secondary ink container provides a pressure to the secondary ink container during a purging operation to cause the ink to flow from the at least one printhead. The secondary ink container has a large enough…
Methods and apparatus for monitoring internal signals in an integrated circuit
Granted: June 17, 2008
Patent Number:
7389452
Apparatus and methods are provided for debugging an integrated circuit. Local multiplexer circuits are provided near first and second circuit blocks in the integrated circuit. Each multiplexer circuit includes input nodes, a control node, and an output node. A first input node of the first multiplexer circuit is coupled to an internal node of the first circuit block, a first input node of the second multiplexer circuit is coupled to an internal node of the second circuit block, second…
Simple and inexpensive high-capacity output catch tray for document production machines
Granted: May 6, 2008
Patent Number:
7367559
The invention is relates to a simple, inexpensive high capacity output catch tray for copiers and other document production machines. The output tray automatically increases in capacity as the stack of copies in it accumulates, without external power source or control, while maintaining a relatively constant elevation relative to the copier output port, and automatically returns to its original position when partially or completely unloaded.
Radiation curable ink compositions and applications thereof
Granted: April 29, 2008
Patent Number:
7365105
Radiation curable ink compositions that include a curable component having a functionality that is greater than two, is present in the ink composition in an amount greater than 30 percent by weight, and has a molecular weight in the range of about 400 g/mole to about 10,000 g/mole; a component that has a functionality that is less than or equal to 2; and an initiator component. A solvent component, pigment, a surface tension modifier and other materials also can be included. The…
Methods and apparatus for real time calibration of a marking engine in a print system
Granted: March 25, 2008
Patent Number:
7349124
Methods and apparatus are disclosed for modifying the rendered output of a marking engine for a print job in progress. A marking engine commences printing print data for a print job. A parameter of a printed page of the print job is measured while the marking engine prints the print job. The measured parameter is compared to a reference, and the print data are modified before the print job completes, such that all subsequent portions of the print job are rendered with modified print…
Method and apparatus for providing a color-balanced multiple print engine
Granted: March 11, 2008
Patent Number:
7342686
A method and apparatus is disclosed for color balancing page data, from a variety of input sources having non-consistent device color profiles, among a plurality of individually accessible print engines arranged in a system for color printing multiple copies of multiple page documents. Input page data is converted to a common color space, rasterized and routed to a selected print engine. Page data routed to each marking engine is color balanced to the selected marking engine where at…
Methods and apparatus for requesting and receiving a print job via a polling device associated with a printer
Granted: March 11, 2008
Patent Number:
7343438
The present invention relates to methods and apparatus for requesting and receiving print jobs over a communications network. In particular, the present invention enables a user to obtain print jobs at a location which may be unspecified, and which may be remote from the source of the print job. A spooling server is used to store a print job received via the network from a print job source. A printer polling device, which may be used at a location remote from the client device, is…
Methods and apparatus for watermarking digitally printed documents
Granted: December 11, 2007
Patent Number:
7307761
A form of stochastic random distribution is used to print an invisible watermark using a typical, e.g. 600 dpi, printer. The watermark contains such information as “Do Not Copy,” or other such information. While the watermark is not visible on a first generation version of a document that is printed, various techniques are used to print the watermark in such a way that it becomes readily apparent when the first generation document is photocopied. The preferred embodiment of the…
Systems for print job monitoring
Granted: December 4, 2007
Patent Number:
7304753
A client print server link is provided, which uses two-way communication between a client computer and a printing system typically having networked output devices and print servers. The client print server link provides detailed information regarding each print server and connected device within a printing system. The client print server link allows a client user at a client computer to access information and control each of their print jobs quickly and efficiently within a single…
Method and apparatus for determining toner level in electrophotographic print engines
Granted: November 27, 2007
Patent Number:
7301665
The toner in the toner cartridge is determined by taking each of the rasterized images output by the RIP and evaluating the pixel levels over the surface thereof. The average value is determined as a percentage of the maximum toner that can be applied to the page. This is then subtracted from a toner value and a remaining toner level determined. Further, all pages of the rasterized document can be evaluated to predetermine the toner level after printing. If this falls below a…
