US2824815A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carbon paper and method of making same
Assignee: Thilmany Pulp and Paper Co
•
Filing: 1956-01-18
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Granted: 1958-02-25
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Expires: 1976-01-18
Abstract
No abstract record available.
Inventors
- 👤 Martin L Downs
- 👤 Robert C Dressler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:30
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/03; D21H17/05; D21H17/11; B; B41; B41M; B41M5/00; B41M5/10; D21H17/06; D21H19/00; D21H19/10; D21H19/14; D21H19/18; Y; Y10; Y10T; Y10T428/00; Y10T428/27; Y10T428/31504; Y10T428/31801; Y10T428/31804; Y10T428/31808
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
99 words
AN IMPROVED PROCESS FOR THE MANUFACTURE OF CARBON PAPER COMPRISING THE STEPS OF APPLYING A NON-FILM FORMING CHROMIUM COORDINATION COMPLEX OF SATURATED PERFLUOROMONOCARBOXYLIC ACID, THE ACID MOLECULE HAVING MORE THAN 4 AND LESS THAN 10 CARBON ATOMS IN THE MOLECULE, TO A SHEET HAVING A BASIS WEIGHT OF BETWEEN ABOUT 4 POUNDS AND ABOUT 15 POUNDS PER REAM (20 INCHES BY 30 INCHES FOR 500 SHEETS), SAID MATERIAL BEING APPLIED TO SAID SHEET IN AN AMOUNT OF BETWEEN ABOUT .02 AND .5 PERCENT OF THE WEIGHT OF SAID SHEET, AND COATING SAID SHEET WITH A MELTED PIGMENTED WAX VEHICLE.
Claim 2
Dependent Claim
99 words
AN IMPROVED PROCESS FOR THE MANUFACTURE OF CARBON PAPER COMPRISING THE STEPS OF APPLYING A NON-FILM FORMING CHROMIUM COORDINATION COMPLEX OF SATURATED PERFLUOROMONOCARBOXYLIC ACID, THE ACID MOLECULE HAVING MORE THAN 4 AND LESS THAN 10 CARBON ATOMS IN THE MOLECULE, TO A SHEET HAVING A BASIS WEIGHT OF BETWEEN ABOUT 4 POUNDS AND ABOUT 15 POUNDS PER REAM (20 INCHES BY 30 INCHES FOR 500 SHEETS), SAID MATERIAL BEING APPLIED TO SAID SHEET IN AN AMOUNT OF BETWEEN ABOUT .02 AND .5 PERCENT OF THE WEIGHT OF SAID SHEET, AND COATING SAID SHEET WITH A MELTED PIGMENTED WAX VEHICLE.
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) | 1961-02-24 | 1961-08-26 | 1962-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-02-24 | 1965-08-26 | 1966-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-02-24 | 1969-08-26 | 1970-02-25 | $7700.00 | Window Closed / Lapsed |