Patent US4954430A successfully refreshed from Google Patents.
Patent US2834797A successfully refreshed from Google Patents.
US2834797A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing mono- and dialkyl hydrogen phosphites
Assignee: Monsanto Chemicals Ltd
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Filing: 1953-02-25
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Granted: 1958-05-13
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Expires: 1973-02-25
Abstract
No abstract record available.
Inventors
- 👤 David H Chadwick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 03:39
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/06; C07F9/08; C07F9/141; C07F9/142
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
93 words
THE METHOD OF PREPARING AN ALKYL HYDROGEN PHOSPHITE WHEREIN THE ALKYL SUBSTITUTENT CONTAINS FROM 1 TO 6 CARBON ATOMS, WHICH CONSISTS IN REACTING AN ESTER SELECTED FROM THE GROUP CONSISTING OF DIALKYL PHOSPHITES AND TRIALKYL PHOSPHITES, WHEREIN THE RESPECTIVE PHOSPHITES THE ALKYL SUBSTITUTES CONTAIN FROM 1 TO 6 CARBON ATOMS, AND PHOSPHOROUS ACID IN A MOLAR RATIO OF SAID ESTER TO SAID PHOSPHOROUS ACID OF ABOUT 100:1 TO ABOUT 1:100 AT A TEMPERATURE WITHIN THE RANGE OF ABOUT 25*C. UP TO THE TEMPERATURE AT WHICH SUBSTANTIAL DECOMPOSITION OF THE REACTION PRODUCTS IS AVOIDED.
Claim 2
Independent Claim
93 words
THE METHOD OF PREPARING AN ALKYL HYDROGEN PHOSPHITE WHEREIN THE ALKYL SUBSTITUTENT CONTAINS FROM 1 TO 6 CARBON ATOMS, WHICH CONSISTS IN REACTING AN ESTER SELECTED FROM THE GROUP CONSISTING OF DIALKYL PHOSPHITES AND TRIALKYL PHOSPHITES, WHEREIN THE RESPECTIVE PHOSPHITES THE ALKYL SUBSTITUTES CONTAIN FROM 1 TO 6 CARBON ATOMS, AND PHOSPHOROUS ACID IN A MOLAR RATIO OF SAID ESTER TO SAID PHOSPHOROUS ACID OF ABOUT 100:1 TO ABOUT 1:100 AT A TEMPERATURE WITHIN THE RANGE OF ABOUT 25*C. UP TO THE TEMPERATURE AT WHICH SUBSTANTIAL DECOMPOSITION OF THE REACTION PRODUCTS IS AVOIDED.
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) | 1961-05-12 | 1961-11-11 | 1962-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-05-12 | 1965-11-11 | 1966-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-05-12 | 1969-11-11 | 1970-05-13 | $7700.00 | Window Closed / Lapsed |