US3778262A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Improved electrophotographic process
Assignee: International Business Machines Corp
•
Filing: 1971-01-28
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Granted: 1973-12-11
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Expires: 1991-01-28
Abstract
Abstract This is an electrophotographic process comprising the step of contacting a latent electrostatic image with a developer comprising carrier and toner. The carrier is a core coated with a continuous film of a fluoropolymer and a modifying resin. This carrier has a positive triboelectric charge with respect to the toner. This positive charge is obtained by curing the coated carrier at a temperature less than 700*F.
Inventors
- 👤 C Queener
- 👤 W Ralston
- 👤 T Smith
- 👤 J Welsh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:07
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/10; G03G9/113; G03G9/1132; G03G9/1133; G03G9/1134; G03G9/1135; G03G9/1136; G03G9/1137
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
13 words
The process according to claim 1 in which the fluoropolymer is a fluorocarbon.
Claim 2
Dependent Claim
26 words
The process according to claim 2 in which the fluorocarbon is a copolymer of tetrafluoroethylene and hexafluoropropylene having thermal properties very close to the 1:1 copolymer.
Claim 3
Dependent Claim
14 words
The process according to claim 3 in which the modifying resin is epoxy resin.
Claim 4
Dependent Claim
14 words
The process according to claim 3 in which the modifying resin is urethane resin.
Claim 5
Dependent Claim
16 words
The process according to claim 3 in which the modifying resin is methyl phenyl silicone resin.
References Cited (Backward Citations)
US2638416A
Cited
US2618551A
Cited
US3093039A
Cited
US3533835A
Cited
US3507686A
Cited
US3558492A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-10 | 1977-06-11 | 1977-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-10 | 1981-06-11 | 1981-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-10 | 1985-06-11 | 1985-12-11 | $7700.00 | Window Closed / Lapsed |