Patent US3821931A successfully refreshed from Google Patents.
US3821931A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copying-printing apparatus
Assignee: Canon Inc
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Filing: 1972-02-28
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Granted: 1974-07-02
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Expires: 1992-02-28
Abstract
Abstract An electrophotographic copier unit and an offset printer unit are combined together to constitute a copying-printing apparatus in accordance with the principles of the present invention, which utilizes an electrophotographic process to accomplish offset printing, utilizes preferably the wet type development to develop an electrostatic latent image, and utilizes an image transfer system to transfer the developed image to a transfer sheet. Such transfer sheet may in turn be used as an offset master sheet. Thus, the apparatus can perform copying and printing operations at high speeds and produce multiple copies in a short time and in an economical and hygienical manner.
Inventors
- 👤 K Yamaji
- 👤 A Kurahashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:02
CPC Classifications
B; B41; B41L; B41L17/00; B41L17/02; B41L17/06; G; G03; G03G; G03G15/00; G03G15/22; G03G15/228; Y; Y10; Y10S; Y10S101/00; Y10S101/37
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
109 words
A copying-printing apparatus comprising a photosensitive member for repetitive use, means for forming an electrostatic latent image on the surface of said photosensitive member, means for developing said electrostatic latent image, means for supplying a master sheet, means for transferring said developed image onto said master sheet, a conductive elastic drum for retaining said master sheet for winding therearound, means for applying a transfer bias voltage to said drum at least when said developed image is transferred onto said master sheet, means for supplying ink to said master sheet, means for supplying a printing sheet, and means for impressing said ink from said master sheet onto said printing sheet.
Claim 2
Dependent Claim
109 words
A copying-printing apparatus comprising a photosensitive member for repetitive use, means for forming an electrostatic latent image on the surface of said photosensitive member, means for developing said electrostatic latent image, means for supplying a master sheet, means for transferring said developed image onto said master sheet, a conductive elastic drum for retaining said master sheet for winding therearound, means for applying a transfer bias voltage to said drum at least when said developed image is transferred onto said master sheet, means for supplying ink to said master sheet, means for supplying a printing sheet, and means for impressing said ink from said master sheet onto said printing sheet.
Claim 3
Dependent Claim
16 words
A copying-printing apparatus according to claim 1, wherein said developing means is a liquid developing device.
Claim 4
Dependent Claim
31 words
A copying-printing apparatus according to claim 2, wherein said master sheet has a solvent resistivity of 0.14 to 25 seconds and smoothness of 25 to 150 seconds (according to Bekk indication).
Claim 5
Dependent Claim
17 words
A copying-printing apparatus according to claim 1, wherein said developing means is a dry type developing device.
Claim 6
Dependent Claim
40 words
A copying-printing apparatus according to claim 1, wherein said photosensitive member is in the form of cylindrical drum, and said developed image transfer means and said ink transfer means are provided by an area of contact between said two drums.
Claim 7
Dependent Claim
20 words
A copying-printing apparatus according to claim 1, wherein said master sheet supply means is provided within said conductive elastic drum.
Claim 8
Dependent Claim
46 words
A copying-printing apparatus according to claim 1, wherein said photosensitive medium and said master sheet holder member are in the form of cylindrical drums, and said developed image transfer means and said ink transfer means are provided by an area of contact between said two drums.
Claim 9
Dependent Claim
115 words
A copying-printing apparatus comprising a photosensitive member for repetitive use, means for forming an electrostatic latent image on the surface of said photosensitive member, means for developing said electrostatic latent image, means for supplying sheet material capable of use selectively as a master sheet and as a printing sheet, means for transferring said developed image onto said master sheet, a conductive elastic drum for retaining said master sheet for winding therearound, means for applying a transfer bias voltage to said drum at least when said developed image is transferred onto said master sheet, means for supplying ink to said master sheet, and means for impressing said ink from said master sheet onto said printing sheet.
Claim 10
Dependent Claim
115 words
A copying-printing apparatus comprising a photosensitive member for repetitive use, means for forming an electrostatic latent image on the surface of said photosensitive member, means for developing said electrostatic latent image, means for supplying sheet material capable of use selectively as a master sheet and as a printing sheet, means for transferring said developed image onto said master sheet, a conductive elastic drum for retaining said master sheet for winding therearound, means for applying a transfer bias voltage to said drum at least when said developed image is transferred onto said master sheet, means for supplying ink to said master sheet, and means for impressing said ink from said master sheet onto said printing sheet.
Claim 11
Dependent Claim
47 words
A copying-printing apparatus according to claim 8, wherein said photosensitive medium and said master sheet holder member are in the form of a cylindrical drum, and said developed image transfer means and said ink transfer means are provided by an area of contact between said two drums.
Claim 12
Dependent Claim
16 words
A copying-printing apparatus according to claim 8, wherein said developing means is a liquid developing device.
Claim 13
Dependent Claim
31 words
A copying-printing apparatus according to claim 10, wherein said master sheet has a solvent resistivity of 0.14 to 25 seconds and smoothness of 25 to 150 seconds (according to Bekk indication).
Claim 14
Dependent Claim
17 words
A copying-printing apparatus according to claim 8, wherein said developing means is a dry type developing device.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-01 | 1977-12-31 | 1978-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-01 | 1981-12-31 | 1982-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-01 | 1985-12-31 | 1986-07-02 | $7700.00 | Window Closed / Lapsed |