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Expired patents of:
Ricoh Company, Ltd.

Displaying 1 to 50 of 162 patents. (Retrieval took 2.398 seconds.)

 Patent TitleExpired:
1.Image forming apparatus capable of forming an erasable image2007-02-28
2.Developing apparatus and method including grooved developer carrying roller2007-02-07
3.Dry etching endpoint detection system2007-02-04
4.Thermosensitive recording material2007-02-02
5.Developing device for image forming apparatus2007-01-26
6.Jam detector for an image fixing apparatus2006-12-31
7.Sublimation-type thermal color image transfer recording medium2006-12-27
8.Optical disk device and method for controlling head movement thereof2006-12-20
9.Image formation method2006-12-06
10.Method and system for indexing three-dimensional solid model data based upon modification history2006-12-01
11.Wet image forming apparatus including an intermediate transfer body having projections2006-12-01
12.Magneto-optical recording method and magneto-optical recording medium2006-11-29
13.Sublimation-type thermal image transfer recording medium and thermal image transfer recording method using the same2006-11-10
14.Sublimation thermal transfer receiving material and image forming method therefor2006-11-10
15.Color video signal processing method and apparatus for converting digital color difference component signals into digital RGB component signals by a digital conversion2006-11-03
16.Graphics processing apparatus for smoothing edges of images2006-10-18
17.Thermal image transfer recording medium2006-10-04
18.Line data-block data converting circuit2006-03-29
19.Flexible frame buffer for raster output devices2006-03-29
20.Switchable automatic document feeder capable of feeding continuous form documents or single sheet documents2006-03-22
21.Method and device for determining fiber orientation of paper, and apparatus for removing image forming substance from paper2006-03-17
22.Image forming method and apparatus which controls the discharging of toner images before transfer2006-03-17
23.Color image forming apparatus having means for properly superimposing image colors on each other2006-03-15
24.Ink-jet head2006-03-12
25.Electrostatic typeinkjet head having a vent passage and a manufacturing method thereof2006-03-12
26.Image receiving sheet for sublimation transfer2006-03-10
27.Semiconductor device having a minute contact hole2006-03-10
28.Focus state detection device2006-03-08
29.Liquid jet recording head with selected bubble disappearance position2006-03-08
30.Color image forming apparatus2006-03-03
31.Communication circuit receiving data selectably synchronized to the rising or falling edge of a timing signal provided from the data source2006-03-03
32.Image forming apparatus2006-02-24
33.DC linear motor2006-02-22
34.Image forming apparatus having system for reducing noise2006-02-22
35.Sublimation-type thermal image transfer recording medium2006-02-15
36.Temperature control method for a fixing device2006-02-15
37.Image forming apparatus with image reading unit2006-02-15
38.Automatic document feeder capable of feeding a document in the form of a computer form2006-01-18
39.Spread spectrum communication system2006-01-18
40.Image reading apparatus having a function for correcting dark signals generated in a photoelectric conversion element2006-01-11
41.Facsimile machine using ISDN basic interface2006-01-11
42.Optical pick-up for use with an opto-magnetic signal2006-01-11
43.Single-pass multicolor thermal transfer2005-12-28
44.Neuron unit for processing digital information2005-12-28
45.Servo signal generator for optical disk driving apparatus2005-12-21
46.Image forming equipment having improved toner sensing2005-12-14
47.Compact zoom lens2005-12-14
48.Electrophotographic photoreceptor and method of manufacturing comprising simultaneously vapor depositing charge generating material and oligomer2005-12-07
49.Electrophotographic recording apparatus having magazine unit for storing developer2005-12-07
50.Facsimile apparatus with two different sized paper supply rolls having timer/counter to choose primary supply roll to prevent curling2005-12-07

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