US3044992A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copolymers of maleic anhydride with n-vinyl-cyclic carbamates
Assignee: Dow Chemical Co
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Filing: 1960-04-04
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Granted: 1962-07-17
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Expires: 1980-04-04
Abstract
No abstract record available.
Inventors
- 👤 Billy B Hibbard
- 👤 Darrell D Weage
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:15
CPC Classifications
C; C08; C08F; C08F22/00; C08F22/04; C08F8/00; C08F8/44; C08F2800/00; C08F2800/10; C08F2800/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
22 words
COPOLYMERS OF MALEIC ANHYDRIDE WITH AN N-VINYL CYCLIC CARBAMATE SELECTED FROM THE GROUP CONSISTING OF N-VINYL-2-OXAZINIDONE AND SUBSTITUTED N-VINYL-2-OXAZOLIDINONES HAVING THE STRUCTURE:
Claim 2
Dependent Claim
22 words
COPOLYMERS OF MALEIC ANHYDRIDE WITH AN N-VINYL CYCLIC CARBAMATE SELECTED FROM THE GROUP CONSISTING OF N-VINYL-2-OXAZINIDONE AND SUBSTITUTED N-VINYL-2-OXAZOLIDINONES HAVING THE STRUCTURE:
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) | 1965-07-16 | 1966-01-15 | 1966-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-07-16 | 1970-01-15 | 1970-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-07-16 | 1974-01-15 | 1974-07-17 | $7700.00 | Window Closed / Lapsed |