US3726841A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cross-linking polymers
Assignee: Zeon Chemical LP
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Filing: 1972-02-04
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Granted: 1973-04-10
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Expires: 1992-02-04
Abstract
Abstract IT HAS BEEN FOUND THAT THE PRESENCE OF A SMALL AMOUNT OF A ALIPHATIC, CYCLIC OR ACYCLIC QUATERNARY AMMONIUM HALIDE SALT OR TETRAALKYL PHOSPHONIUM HALIDE SALT ENHANCES THE CROSS-LINKING RATE OF POLYMERS AND COPOLYMERS OF EPIHALOHYDRIN WHEN CROSS-LINKED WITH UREA, THIOUREA, AMMONIA, VARIOUS POLYAMINES OR CERTAIN HETEROCYCLIC COMPOUNDS IN COMBINATION WITH CERTAIN METAL COMPOUNDS.
Inventors
- 👤 J Mirolli
- 👤 E Vandenberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:38
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/16; C08K5/17; C08K5/19; C08K5/49; C08K5/50
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) | 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 |