Patent US3826767A successfully refreshed from Google Patents.
US3826767A
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US
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Anionic dextran graft copolymers
Assignee: Calgon Corp
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Filing: 1972-01-26
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Granted: 1974-07-30
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Expires: 1992-01-26
Abstract
Abstract NOVEL ANIONIC GRAFT COPOLYMERS OF ACRYLAMIDE AND/OR CERTAIN POLYMERIZABLE ANIONIC MONOMERS GRAFTED ONTO A DEXTRAN SUBSTRATE ARE DISCLOSED.
Inventors
- 👤 R Schaper
- 👤 M Hoover
- 👤 G Sinkovitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:56
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/21; D21H17/24; C; C02; C02F; C02F1/00; C02F1/52; C02F1/5263; C02F1/54; C08; C08F; C08F251/00
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) | 1977-07-29 | 1978-01-28 | 1978-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-29 | 1982-01-28 | 1982-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-29 | 1986-01-28 | 1986-07-30 | $7700.00 | Window Closed / Lapsed |