Patent US3726822A successfully refreshed from Google Patents.
US3726822A
Expired / Lapsed
US
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Modified anionic paper-sizing agents
Assignee: Bayer AG
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Filing: 1971-07-07
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Granted: 1973-04-10
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Expires: 1991-07-07
Abstract
Abstract ANIONIC PAPER-SIZING AGENTS BASED ON MIXTURES OF (A) WATER-SOLUBLE SALTS OF COPOLYMERS FROM OLEFINICALLY UNSATURATED MONOMERS SUCH AS ETHYLENE, STYRENE, ISOBUTYLENE OR INDENE AND MALEIC OR ITACONIC ACID IMIDE AND (B) A LATEX OF A COPOLYMER OF OLEFINICALLY UNSATURATED MONOMERS SUCH AS AN AROMATIC VINYL COMPOUND, VINYL ESTER, ETHER, HALIDE OR AMIDE, (METH)ACRYLIC ESTER OR A NITRILE, ESTER OR AMIDE.
Inventors
- 👤 Bonin W Von
- 👤 H Honig
- 👤 W Theuer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:02
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/34; D21H17/41; D21H17/42; D21H17/43; C; C09; C09J; C09J135/00; C08; C08L; C08L2666/00; C08L2666/02; C08L2666/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-09 | 1976-10-09 | 1977-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-09 | 1980-10-09 | 1981-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-09 | 1984-10-09 | 1985-04-10 | $7700.00 | Window Closed / Lapsed |