Patent US4420528A successfully refreshed from Google Patents.
US4420528A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transfer film for electrophotographic copier
Assignee: Fujifilm Holdings Corp
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Filing: 1983-01-28
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Granted: 1983-12-13
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Expires: 2003-01-28
Abstract
Abstract A transfer film for an electrophotographic copier comprising a polysulfone resin is disclosed. The film is matted and has a dynamic friction coefficient of from 0.6 to 2.0, a static friction coefficient of from 0.8 to 2.3, a surface resistance of from 1x1010 to 1x1015 ohms, at least one side of said film having a surface roughness of 1.0 micron or more.
Inventors
- 👤 Toshiaki Okiyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:39
CPC Classifications
G; G03; G03G; G03G7/00; G03G7/006; G03G7/0073; G03G7/008; Y; Y10; Y10S; Y10S428/00; Y10S428/914; Y10T; Y10T428/00; Y10T428/25; Y10T428/26; Y10T428/268; Y10T428/31; Y10T428/31504; Y10T428/31533
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
99 words
A transfer film of the type used in connection with an electrophotographic copier, comprising: polysulfone resin, wherein said film comprised of polysulfone resin is matted and has a dynamic friction coefficient of from 0.6 to 2.0, a static friction coefficient of from 0.8 to 2.3, comprises an inorganic or organic particulate additive in an amount to provide a surface resistance of from 1×10 10 to 1×10 15 ohms, wherein at least one side of said film has a surface roughness of 2.0 micron or more, said film being self-supporting and having a thickness of from 25 to 100 μm.
Claim 2
Dependent Claim
99 words
A transfer film of the type used in connection with an electrophotographic copier, comprising: polysulfone resin, wherein said film comprised of polysulfone resin is matted and has a dynamic friction coefficient of from 0.6 to 2.0, a static friction coefficient of from 0.8 to 2.3, comprises an inorganic or organic particulate additive in an amount to provide a surface resistance of from 1×10 10 to 1×10 15 ohms, wherein at least one side of said film has a surface roughness of 2.0 micron or more, said film being self-supporting and having a thickness of from 25 to 100 μm.
Claim 3
Dependent Claim
19 words
A transfer film as claimed in claim 1, wherein said film has an opacity of from 20 to 65%.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-12-12 | 1987-06-13 | 1987-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-12 | 1991-06-13 | 1991-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-12 | 1995-06-13 | 1995-12-13 | $7700.00 | Window Closed / Lapsed |