US4474898A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure-sensitive copying paper of "transfer to plain paper" type
Assignee: Mitsubishi Paper Mills Ltd
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Filing: 1983-07-12
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Granted: 1984-10-02
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Expires: 2003-07-12
Abstract
Abstract A pressure-sensitive copying paper of "transfer to plain paper" type obtained by coating a mixture comprising (a) a colorless to light-colored electron-donating color former, (b) a colorless to light-colored electron-accepting color developer giving a colored product by reacting with said color former (a), (c) a wax and (d) a polyvinyl ether, on one side of a support and drying the coated support, provides an advantage which conventional copying papers of "transfer to plain paper" type do not possess, in that the density of a transfer image formed on a plain paper is higher than that of a reverse image formed on the coated side of a copying paper.
Inventors
- 👤 Toshihiko Matsushita
- 👤 Shigetoshi Hiraishi
- 👤 Sadao Morishita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:52
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/124; B41M5/132; Y; Y10; Y10S; Y10S428/00; Y10S428/914
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
62 words
A pressure-sensitive copying paper of "transfer to plain paper" type obtained by coating a mixture comprising (a) a colorless to light-colored electron-donating color former, (b) a colorless to light-colored electron-accepting color developer giving a colored product by reacting with said color former (a), (c) a wax and (d) a polyvinyl ether, on one side of a support and drying the coated support.
Claim 2
Dependent Claim
62 words
A pressure-sensitive copying paper of "transfer to plain paper" type obtained by coating a mixture comprising (a) a colorless to light-colored electron-donating color former, (b) a colorless to light-colored electron-accepting color developer giving a colored product by reacting with said color former (a), (c) a wax and (d) a polyvinyl ether, on one side of a support and drying the coated support.
Claim 3
Dependent Claim
28 words
A pressure-sensitive copying paper of "transfer to plain paper" type according to claim 1, wherein both or either of the color former and the color developer is microencapsulated.
Claim 4
Dependent Claim
41 words
A pressure-sensitive copying paper of "transfer to plain paper" type according to claim 1, wherein the polyvinyl ether is selected from the group consisting of polyvinyl methyl ether, polyvinyl ethyl ether, polyvinyl propyl ether, polyvinyl butyl ether and polyvinyl isobutyl ether.
References Cited (Backward Citations)
US3924041A
Cited
JPS5316728A
Cited
US4273602A
Cited
JPS54126111A
Cited
JPS54159008A
Cited
US4352855A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-10-02 | 1988-04-02 | 1988-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-02 | 1992-04-02 | 1992-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-02 | 1996-04-02 | 1996-10-02 | $7700.00 | Window Closed / Lapsed |