US3687541A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Xerographic duplex technique
Assignee: Xerox Corp
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Filing: 1970-12-23
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Granted: 1972-08-29
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Expires: 1990-12-23
Abstract
Abstract Method and apparatus are herein disclosed for creating a duplex copy. First and second dry toner images are formulated on an image retaining member. The first image is electrically transferred to a storage member. A sheet of final support material is placed over the first image supported on the storage member and the second image electrically transferred to the opposite side of the support sheet. Sufficient pressure is applied to the sheet while it is in contact with the storage member to bond the images to the sheet whereby the image remains upon the sheet as it is removed from the storage member.
Inventors
- 👤 Gilbert A Aser
- 👤 William A Sullivan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:04
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/22; G03G15/23; G03G15/231; G03G15/232
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
161 words
The method of sequentially transferring a first charged powder image indirectly and a second charged powder image directly from the surface of an image retaining element onto both sides of a sheet of final support material including bringing an electrically biased transfer member into electrical communication with said image retaining element to transfer said first image from the image retaining element to the surface of said transfer member, securing a sheet of final support material to the biased transfer member with the backside of the sheet in contact with the first image retained thereon, bringing the transfer member once again in electrical communication with said image retaining element to transfer said second image from the image retaining element to the top side of said final support sheet, and applying pressure to the sheet secured to said transfer member to bond said images to both sides of said sheet whereby said first image is transferred from said transfer member to said sheet.
Claim 2
Independent Claim
161 words
The method of sequentially transferring a first charged powder image indirectly and a second charged powder image directly from the surface of an image retaining element onto both sides of a sheet of final support material including bringing an electrically biased transfer member into electrical communication with said image retaining element to transfer said first image from the image retaining element to the surface of said transfer member, securing a sheet of final support material to the biased transfer member with the backside of the sheet in contact with the first image retained thereon, bringing the transfer member once again in electrical communication with said image retaining element to transfer said second image from the image retaining element to the top side of said final support sheet, and applying pressure to the sheet secured to said transfer member to bond said images to both sides of said sheet whereby said first image is transferred from said transfer member to said sheet.
Claim 3
Dependent Claim
19 words
The method of claim 1 wherein sufficient pressure is applied to permanently fix said images to the support sheet.
Claim 4
Dependent Claim
33 words
The method of claim 1 further including the steps of stripping the final support sheet from said transfer member, and permanently fixing said first and second images bonded to the final support sheet.
Claim 5
Dependent Claim
25 words
The method of claim 1 further including the step of reMoving the electrical bias from said transfer member prior to applying pressure to said sheet.
Claim 6
Independent Claim
159 words
The method of producing a duplex copy including formulating a first charged toner image on the surface of a photoconductive plate, bringing an electrically biased transfer member into electrical communication with said photoconductive plate to transfer said first formulated toner image from the plate to the transfer member, securing a sheet of final support material to the transfer member with one side of the sheet contacting the transfer image supported thereon, formulating a second charge toner image on said photoconductive plate, bringing said electrical bias transfer member into electrical communication with said plate to transfer said second toner image to the opposite side of said final support sheet, applying pressure to the sheet secured to said transfer member to bond said images to said opposite sides of said support sheet whereby said first image is transferred from said member to said sheet, and removing said support sheet with the first and second images bonded thereto from said transfer member.
Claim 7
Independent Claim
159 words
The method of producing a duplex copy including formulating a first charged toner image on the surface of a photoconductive plate, bringing an electrically biased transfer member into electrical communication with said photoconductive plate to transfer said first formulated toner image from the plate to the transfer member, securing a sheet of final support material to the transfer member with one side of the sheet contacting the transfer image supported thereon, formulating a second charge toner image on said photoconductive plate, bringing said electrical bias transfer member into electrical communication with said plate to transfer said second toner image to the opposite side of said final support sheet, applying pressure to the sheet secured to said transfer member to bond said images to said opposite sides of said support sheet whereby said first image is transferred from said member to said sheet, and removing said support sheet with the first and second images bonded thereto from said transfer member.
Claim 8
Dependent Claim
25 words
The method of claim 5 further including the step of removing an electrical bias from said transfer member prior to applying pressure to said sheet.
Claim 9
Dependent Claim
19 words
The method of claim 6 further including the step of permanently fixing the bonded images to said support sheet.
Claim 10
Dependent Claim
20 words
The method of claim 5 wherein sufficient pressure is applied to permanently fix the toner images to the support sheet.
Claim 11
Dependent Claim
199 words
Apparatus for producing a duplex copy including means to sequentially formulate a first and a second toner image on a moving photoconductive plate, an electrically biased transfer roll arranged to move in timed relation with said photoconductive plate through a region of electrical communication such that the first toner image is transferred from the plate to the roll surface and the image recirculated thereon through the region of electrical communication in synchronization with said second image on the photoconductive plate, securing means operatively associated with said transfer roll for securing a final sheet of support material against the roll with one side thereof in contact with said first image, whereby said second image is transferred to the opposite side of said sheet upon recirculating said first image and final support through the region of electrical communication and pressure applying means positioned adjacent to said transfer roll and being adapted to apply pressure to said sheet secured to said transfer roll to bond said images to opposite sides of said sheet whereby said first image is transferred from said roll to said sheet, and means to remove said sheet with said first and second images bonded thereto from said roll.
Claim 12
Dependent Claim
199 words
Apparatus for producing a duplex copy including means to sequentially formulate a first and a second toner image on a moving photoconductive plate, an electrically biased transfer roll arranged to move in timed relation with said photoconductive plate through a region of electrical communication such that the first toner image is transferred from the plate to the roll surface and the image recirculated thereon through the region of electrical communication in synchronization with said second image on the photoconductive plate, securing means operatively associated with said transfer roll for securing a final sheet of support material against the roll with one side thereof in contact with said first image, whereby said second image is transferred to the opposite side of said sheet upon recirculating said first image and final support through the region of electrical communication and pressure applying means positioned adjacent to said transfer roll and being adapted to apply pressure to said sheet secured to said transfer roll to bond said images to opposite sides of said sheet whereby said first image is transferred from said roll to said sheet, and means to remove said sheet with said first and second images bonded thereto from said roll.
Claim 13
Dependent Claim
23 words
The apparatus of claim 9 having further means to electrically remove the bias from said roll prior to applying pressure to said sheet.
Claim 14
Dependent Claim
23 words
The apparatus of claim 10 having further means to permanently fix the bonded toner images to said opposite sides of said support sheet.
Claim 15
Dependent Claim
56 words
The apparatus of claim 9 wherein said pressure applying means comprises a pressure roll member movably mounted adjacent to said transfer member, and control means operatively associated with said pressure roll to move said pressure roll in and out of contact with said transfer roll to bond said first and second images to said support sheet.
Claim 16
Dependent Claim
14 words
The apparatus of claim 9 wherein said transfer roll comprises an uncoated steel drum.
Claim 17
Dependent Claim
18 words
The apparatus of claim 13 having further means to apply an offset preventing material to said steel drum.
References Cited (Backward Citations)
US3506347A
Cited
US3615129A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-29 | 1976-02-28 | 1976-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-29 | 1980-02-28 | 1980-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-29 | 1984-02-28 | 1984-08-29 | $7700.00 | Window Closed / Lapsed |