US2970926A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carbon paper
Assignee: Underwood Corp
•
Filing: 1957-11-14
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Granted: 1961-02-07
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Expires: 1977-11-14
Abstract
No abstract record available.
Inventors
- 👤 Findlay Hugh Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:04
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/10
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
77 words
A COATING MIXTURE FOR APPLICATION TO SHEET OF CARRIER MATERIAL TO PRODUCE A PRESSURE-SENSITIVE TRANSFER MATERIAL, SAID COATING MIXTURE CONSISTING OF A HOMOGENEOUS MIXTURE OF 1 PART BY WEIGHT OF A CELLULOSE ACETATE BUTYRATE ESTER HAVING ABOUT 13% ACETYL AND 37% BUTYRYL 1.175 TO 2.75 PARTS OF A NON-DRYING OIL, .75 TO 1.50 PARTS TO A COLORING MATTER AND ABOUT 4.5 PARTS OF ETHYL ACETATE TO REDUCE THE VISCOSITY OF SAID MIXTURE TO LESS THAN 1000 CENTIPOISES.
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) | 1964-02-07 | 1964-08-08 | 1965-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-02-07 | 1968-08-08 | 1969-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-02-07 | 1972-08-08 | 1973-02-07 | $7700.00 | Window Closed / Lapsed |