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US2632756A
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Olefinic tetraesters of bis (phospho-noalkyl) ethers and their polymers
Assignee: Shell Development Co
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Filing: 1949-10-15
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Granted: 1953-03-24
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Expires: 1969-10-15
Abstract
No abstract record available.
Inventors
- 👤 Harman Denham
- 👤 Alan R Stiles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:04
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/38; C07F9/40; C07F9/4003; C07F9/4006
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
5 words
A TETRAESTER OF THE FORMULA
References Cited (Backward Citations)
US2397422A
Cited
US2436141A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-03-23 | 1956-09-22 | 1957-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-03-23 | 1960-09-22 | 1961-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-03-23 | 1964-09-22 | 1965-03-24 | $7700.00 | Window Closed / Lapsed |