US3954332A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reproduction machine with improved transfer roll
Assignee: Xerox Corp
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Filing: 1975-01-10
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Granted: 1976-05-04
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Expires: 1995-01-10
Abstract
Abstract Apparatus is provided for heating an electrically biased transfer roll in an electrostatic reproduction machine so as to improve the transfer of a developed electrostatic image from a photoreceptor to a transfer member during operation of the machine. The roll is heated to maintain the resistivity thereof within a range which will effect optimum transfer, and to overcome the detrimental effects of ambient conditions such as humidity changes on the resistivity.
Inventors
- 👤 Donald J. Fisher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:17
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/14; G03G15/16; G03G15/1665; G03G15/167
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
60 words
An electrostatic reproduction machine having a photoreceptor, means for producing a developed electrostatic image on the photoreceptor, and an improved electrically biased transfer roll for transferring the image from the photoreceptor to a support member during operation of the machine, the improvement comprising means for maintaining the resistivity of the roll within a desired range during operation of the machine.
Claim 2
Dependent Claim
60 words
An electrostatic reproduction machine having a photoreceptor, means for producing a developed electrostatic image on the photoreceptor, and an improved electrically biased transfer roll for transferring the image from the photoreceptor to a support member during operation of the machine, the improvement comprising means for maintaining the resistivity of the roll within a desired range during operation of the machine.
Claim 3
Dependent Claim
30 words
An electrostatic reproduction machine according to claim 1, wherein the resistivity maintaining means comprises means for heating the roll to a desired temperature and maintaining the roll at that temperature.
Claim 4
Dependent Claim
19 words
An electrostatic reproduction machine according to claim 2, wherein the heating means comprises a heater located with the roll.
Claim 5
Dependent Claim
38 words
An electrostatic reproduction machine according to claim 2, wherein the transfer roll includes a conductive substrate, and the heating means includes an electrically conductive coating on the substrate, which coating heats up when subjected to an electrical current.
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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) | 1979-05-04 | 1979-11-03 | 1980-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-04 | 1983-11-03 | 1984-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-04 | 1987-11-03 | 1988-05-04 | $7700.00 | Window Closed / Lapsed |