Patent US3459632A successfully refreshed from Google Patents.
US3459632A
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Method of making paper containing starch derivatives having both anionic and cationic groups,and the product produced thereby
Assignee: Indopco Inc
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Filing: 1965-11-17
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Granted: 1969-08-05
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Expires: 1985-11-17
Abstract
No abstract record available.
Inventors
- 👤 Carlyle G Caldwell
- 👤 Wadym Jarowenko
- 👤 Irving D Hodgkin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:16
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/21; D21H17/24; D21H17/28; B; B29; B29C; B29C49/00; B29C49/28; B29C49/30; B29C49/36; C; C08; C08B; C08B31/00; C08B31/08; C08B31/16; B29C2793/00
Claims Analysis
Total Claims: 0
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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) | 1972-08-04 | 1973-02-03 | 1973-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-08-04 | 1977-02-03 | 1977-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-08-04 | 1981-02-03 | 1981-08-05 | $7700.00 | Window Closed / Lapsed |