Patent US2998445A successfully refreshed from Google Patents.
US2998445A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyglycol carbamates
Assignee: California Research LLC
•
Filing: 1959-06-22
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Granted: 1961-08-29
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Expires: 1979-06-22
Abstract
No abstract record available.
Inventors
- 👤 William T Stewart
- 👤 Lowe Warren
- 👤 Frank W Kavanagh
- 👤 Frank A Stuart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:59
CPC Classifications
C; C08; C08F; C08F20/00; C08F20/02; C08F20/10; C08F20/34
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
10 words
N-ETHYLENICALLY UNSATURATED ACYLOXYALKYL POLYALKYLENE GLYCOL CARBAMATES HAVING THE GENERAL FORMULA:
Claim 2
Dependent Claim
10 words
N-ETHYLENICALLY UNSATURATED ACYLOXYALKYL POLYALKYLENE GLYCOL CARBAMATES HAVING THE GENERAL FORMULA:
References Cited (Backward Citations)
US2218939A
Cited
US2626278A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-08-28 | 1965-02-27 | 1965-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-28 | 1969-02-27 | 1969-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-28 | 1973-02-27 | 1973-08-29 | $7700.00 | Window Closed / Lapsed |