US3607374A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drafting film materials
Assignee: Keuffel and Esser Co
•
Filing: 1968-09-23
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Granted: 1971-09-21
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Expires: 1988-09-23
Abstract
Abstract A noncurling drafting film of good ink receptivity is prepared by coating a polyester film support with a silica pigmented composition of an acrylic ester copolymer and a polyvinyl alcohol cross-linked with an aldehyde condensate resin.
Inventors
- 👤 Markus Seibel
- 👤 Klaus Thoese
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:55
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/95; C; C08; C08L; C08L61/00; C08L61/20; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31652; Y10T428/31667; Y10T428/31855; Y10T428/31909; Y10T428/31928
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
24 words
Material according to claim 1 wherein said polyvinyl alcohol has a residual content of unsaponified acetyl groups of not more than about 12 percent.
Claim 2
Dependent Claim
29 words
Material according to claim 1 wherein said finely divided solid is a pigment comprising one or more of the following substances: a. silica, b. aluminum silicate, c. Calcined alumina.
Claim 3
Dependent Claim
108 words
Material according to claim 1 wherein said finely divided solid consists essentially of a pigment in an amount of between about 15 and 35 percent by weight and wherein said binder consists essentially of a. between about 15 and 35 percent by weight of a polyvinyl alcohol of a K value of about 70 and an acetyl group content of about 12 percent; b. about 5 percent by weight, based on said polyvinyl alcohol, of a partially etherified melamine/formaldehyde condensate; and c. between about 35 and 70 percent by weight of a copolymer comprising about 66 percent methyl acrylate, 22 percent vinyl isobutyl ether, and 12 percent styrene.
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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) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |