Patent US2601520A successfully refreshed from Google Patents.
US2601520A
Expired / Lapsed
US
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Dialkenyl alkanephosphonates and polymers thereof
Assignee: Shell Development Co
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Filing: 1949-06-24
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Granted: 1952-06-24
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Expires: 1969-06-24
Abstract
No abstract record available.
Inventors
- 👤 Harman Denham
- 👤 Alan R Stiles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:21
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/38; C07F9/40; C08; C08F; C08F30/00; C08F30/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
38 words
A PHOSPHONIC ACID ESTER HAVING THE STRUCTURE DEFINED BY THE FORMULA R''-P(OR)2 IN WHICH EACH R REPRESENTS A MONO-OLEFINICALLY UNSATURATED HYDROCARBON RADICAL AND R'' REPRESENTS A MEMBER OF THE GROUP CONSISTING OF ALKANE RADICALS AND CARBOCYCLIC-SUBSTITUTED ALKANE RADICALS.
Claim 2
Dependent Claim
38 words
A PHOSPHONIC ACID ESTER HAVING THE STRUCTURE DEFINED BY THE FORMULA R''-P(OR)2 IN WHICH EACH R REPRESENTS A MONO-OLEFINICALLY UNSATURATED HYDROCARBON RADICAL AND R'' REPRESENTS A MEMBER OF THE GROUP CONSISTING OF ALKANE RADICALS AND CARBOCYCLIC-SUBSTITUTED ALKANE RADICALS.
References Cited (Backward Citations)
US2397422A
Cited
US2425766A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-06-24 | 1955-12-24 | 1956-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-06-24 | 1959-12-24 | 1960-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-06-24 | 1963-12-24 | 1964-06-24 | $7700.00 | Window Closed / Lapsed |