Patent US2847458A successfully refreshed from Google Patents.
US2847458A
Expired / Lapsed
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Preparation of arylphosphonic acids
Assignee: Wyeth Holdings LLC
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Filing: 1955-03-25
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Granted: 1958-08-12
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Expires: 1975-03-25
Abstract
No abstract record available.
Inventors
- 👤 Tsai H Chao
- 👤 Hans Z Lecher
- 👤 Ruth A Greenwood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:41
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/38; C07F9/3804; C07F9/3834; C07F9/04; C08; C08F; C08F30/00; C08F30/02
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
65 words
A PROCESS OF PRODUCIG AN ARYLPHOSPHONIC ACID WHICH COMPRISES HEATING AT LEAST 5 MOLAR EQUIVALENTS OF THE CORRESPONDING AROMATIC CARBOCYCLIC COMPOUND, FREE FROM POLAR SUBSTITUENTS CAPABLE OF REACTING WITH P4S10 AT A TEMPERATURE FALLING WITHIN THE RANGE OF 140-250* C. WITH 1 MOLAR EQUIVALENT 3F P4S10 AND HYDROLYZING THE REACTION PRODUCT BY HEATING WITH WATER UNTIL EVOLUTION OF HYDROGEN SULFIDE SUBSTANTIALLY CEASES. 14. 2-ISOPROPYLNAPHTHYLPHOSPHONIC ACID.
Claim 2
Dependent Claim
65 words
A PROCESS OF PRODUCIG AN ARYLPHOSPHONIC ACID WHICH COMPRISES HEATING AT LEAST 5 MOLAR EQUIVALENTS OF THE CORRESPONDING AROMATIC CARBOCYCLIC COMPOUND, FREE FROM POLAR SUBSTITUENTS CAPABLE OF REACTING WITH P4S10 AT A TEMPERATURE FALLING WITHIN THE RANGE OF 140-250* C. WITH 1 MOLAR EQUIVALENT 3F P4S10 AND HYDROLYZING THE REACTION PRODUCT BY HEATING WITH WATER UNTIL EVOLUTION OF HYDROGEN SULFIDE SUBSTANTIALLY CEASES. 14. 2-ISOPROPYLNAPHTHYLPHOSPHONIC ACID.
Claim 3
Dependent Claim
6 words
A COMPOUND HAVING THE FOLLOWING FORMULA
Claim 4
Dependent Claim
6 words
A COMPOUND HAVING THE FOLLOWING FORMULA
References Cited (Backward Citations)
US2316081A
Cited
US2316086A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-08-11 | 1962-02-10 | 1962-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-08-11 | 1966-02-10 | 1966-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-08-11 | 1970-02-10 | 1970-08-12 | $7700.00 | Window Closed / Lapsed |