Patent US2961367A successfully refreshed from Google Patents.
US2961367A
Expired / Lapsed
US
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Sized paper and method of making same
Assignee: Hercules Powder Co
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Filing: 1957-02-27
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Granted: 1960-11-22
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Expires: 1977-02-27
Abstract
No abstract record available.
Inventors
- 👤 Cyrus A Weisgerber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:36
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/03; D21H17/05; D21H17/17
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
72 words
PAPER SIZED WITH FROM ABOUT 0.01% TO ABOUT 1% OF KETENE DIMER AND FROM ABOUT 0.001% TO ABOUT 0.2% OF A POLYMER OF AN ALKYLENEIMINE CONTAINING NOT MORE THAN FOUR CARBON ATOMS, SAID KETENE DIMER HAVING THE FORMULA (RCH=C=012 WHERE R IS A HYDROCARBON RADICAL SELECTED FROM THE GROUP CONSISTING OF ALKYL GROUPS HAVING AT LEAST 8 CARBON ATOMS, CYCLOALKY GROUPS HAVING AT LEAST 6 CARBON ATOMS, ARYL, ARALKYL AND ALKARYL GROUPS
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) | 1963-11-22 | 1964-05-23 | 1964-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-11-22 | 1968-05-23 | 1968-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-11-22 | 1972-05-23 | 1972-11-22 | $7700.00 | Window Closed / Lapsed |