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US2659747A
Expired / Lapsed
US
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Mixed anhydrides of phosphite esters and processes of preparing the same
Assignee: Wyeth Holdings LLC
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Filing: 1950-12-01
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Granted: 1953-11-17
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Expires: 1970-12-01
Abstract
No abstract record available.
Inventors
- 👤 Richard W Young
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:37
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/06; C07F9/08; C07F9/141; C07F9/1415; C07F9/1417
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
17 words
A MIXED ANHYDRIDE OF A DIESTER OF PHOSPHOROUS ACID AND A CARBOXYLIC ACID REPRESENTED BY THE FORMULA:
Claim 2
Dependent Claim
17 words
A MIXED ANHYDRIDE OF A DIESTER OF PHOSPHOROUS ACID AND A CARBOXYLIC ACID REPRESENTED BY THE FORMULA:
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) | 1956-11-16 | 1957-05-18 | 1957-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-16 | 1961-05-18 | 1961-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-16 | 1965-05-18 | 1965-11-17 | $7700.00 | Window Closed / Lapsed |