Patent US3758637A successfully refreshed from Google Patents.
US3758637A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crosslinked polyurea from dihydrazides of methylated muconic acids
Assignee: Sun Research and Development Co
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Filing: 1971-12-30
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Granted: 1973-09-11
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Expires: 1991-12-30
Abstract
Abstract Novel linear polymers having high melting points and suitable for use as adhesives, sealants, films, surface coatings and as chromotographic agents can be prepared from dihydrazides of methylated muconic acids either singularly or in mixtures with each other and an organic diisocyanate. The linear polymer may also be crosslinked by heat or free radicals or with ethylenically unsaturated monomers to produce useful films and coatings.
Inventors
- 👤 R Cassar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:59
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/67; C08G18/675; C08G18/677; C08G18/678
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
24 words
A crosslinked polymer according to claim 1 wherein the vinyl monomer has a mole ratio of monomer to unsaturation of from 1:5 to 5:1.
Claim 2
Dependent Claim
27 words
A crosslinked polymer according to claim 1 wherein the monomer is selected from the group consisting of styrene, butadiene, methyl methacrylate, vinyl acetate, acrylonitrile, vinylidene chloride bisoprene.
Claim 3
Dependent Claim
23 words
A crosslinked polymer according to claim 3 wherein the monomer has a mole ratio or monomer to unsaturation of from 1:5 to 5:1.
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) | 1976-09-10 | 1977-03-12 | 1977-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-10 | 1981-03-12 | 1981-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-10 | 1985-03-12 | 1985-09-11 | $7700.00 | Window Closed / Lapsed |