Patent US3562099A successfully refreshed from Google Patents.
US3562099A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Erasable paper and process for making same
Assignee: MILTON R SHEPPARD
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Filing: 1968-01-17
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Granted: 1971-02-09
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Expires: 1988-01-17
Abstract
Abstract PROCESS FOR MAKING ERASABLE PAPER BY FORMING A PAPER WEB, CONTACTING THE FORMED WIB WITH A PARACHMENTIZED SOLUTION, REMOVING EXCESS ACID, AT LEAST PARTIALLY DRYING THE WEB, AND APPLYING TO A SURFACE OF THE PAPER ONE OR MORE SIZING AGENTS WHICH ARE FLUORINATED CARBOXYLIC ACIDS, AND ARE PREFERABLY PERFLUORINATED CARBOXYLIC ACIDS, AND ARE APPLIED ALONE OR IN COMBINATION WITH CERTAIN ADDITIVES. THE INVENTION ALSO INCLUDES THE PRODUCT OF THE FOREGOING PROCESS.
Inventors
- 👤 William R Wasko
- 👤 Milton R Sheppard
- 👤 Robert J Eber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:02
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/21; D21H17/24; D21H17/31; D21H17/03; D21H17/05; D21H17/14; D21H17/15; D21H17/16; D21H17/28
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-08 | 1974-08-10 | 1975-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-08 | 1978-08-10 | 1979-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-08 | 1982-08-10 | 1983-02-09 | $7700.00 | Window Closed / Lapsed |