US4098947A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copy paper
Assignee: Individual
•
Filing: 1975-02-20
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Granted: 1978-07-04
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Expires: 1995-02-20
Abstract
Abstract A sheet of paper suitable as a multi-copy paper or once only copy paper is made by coating with a layer of finely particulate mutually adherent particles of a vinyl chloride polymer if pigments are used as colouring matter and of any swellable polymer if a dyed layer is to be used. Generally, the particulate material is swelled using suitable swelling agents and applied to a support layer by any suitable coating process.
Inventors
- 👤 Joachim Schmidt
- 👤 Martin Unruh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 22:54
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/10; Y; Y10; Y10S; Y10S428/00; Y10S428/914; Y10S8/00; Y10S8/03; Y10T; Y10T428/00; Y10T428/25; Y10T428/254; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2998; Y10T428/31504; Y10T428/31855; Y10T428/3188; Y10T428/31895; Y10T428/31906
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
110 words
A sheet of paper consisting of a support layer and a substantially uniform donor layer of particulate mutually adherent particles of a vinyl chloride polymer, the polymer having been produced by emulsion polymerization, containing from 0.1 - 4% by weight of an emulsifier and having a K-value in the range from 60 to 80, the particles having an average size of 50 μ or less and having sieve residues under standard DIN conditions of not more than 34% by weight, and said polymer having been dyed by a dye selected from the group consisting of anionic dyes, non-ionic dyes and mixtures thereof prior to incorporation onto said sheet of paper.
Claim 2
Dependent Claim
110 words
A sheet of paper consisting of a support layer and a substantially uniform donor layer of particulate mutually adherent particles of a vinyl chloride polymer, the polymer having been produced by emulsion polymerization, containing from 0.1 - 4% by weight of an emulsifier and having a K-value in the range from 60 to 80, the particles having an average size of 50 μ or less and having sieve residues under standard DIN conditions of not more than 34% by weight, and said polymer having been dyed by a dye selected from the group consisting of anionic dyes, non-ionic dyes and mixtures thereof prior to incorporation onto said sheet of paper.
Claim 3
Dependent Claim
17 words
A sheet of paper according to claim 1, wherein the polymer is dyed with a non-ionic dye.
Claim 4
Dependent Claim
21 words
A sheet of paper according to claim 1 wherein two or more dyes of the same or different type are used.
Claim 5
Dependent Claim
14 words
A sheet of paper according to claim 1 wherein the polymer is anionically dyed.
References Cited (Backward Citations)
US2347508A
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US2394688A
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US2635942A
Cited
US3036924A
Cited
US3328190A
Cited
US3652200A
Cited
US3768968A
Cited
US3697323A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-07-03 | 1982-01-02 | 1982-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-03 | 1986-01-02 | 1986-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-03 | 1990-01-02 | 1990-07-04 | $7700.00 | Window Closed / Lapsed |