US2916508A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparation of 2, 2-dimethyl-1, 3-propanediol cyclic hydrogen phosphite
Assignee: Eastman Kodak Co
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Filing: 1956-10-01
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Granted: 1959-12-08
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Expires: 1976-10-01
Abstract
No abstract record available.
Inventors
- 👤 Richard L Mcconnell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:20
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/547; C07F9/6564; C07F9/6571; C07F9/6574; C07F9/65742
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
33 words
THE PROCESS WHICH COMPRISES REACTING IN SUBSTANTIALLY EQUAL MOLAR PROPORTIONS 2,2-DIMETHYL-1,3-PROPANEDIOL, PHOSPHORUS TRICHLORIDE AND A SATURATED ALIPHATIC ALCOHOL CONTAINING 1-8 CARBON ATOMS AT A TEMPERATURE OF 0-100*C. TO PRODUCE 2,2-DIMETHYL-1,3-PROPANEDIOL CYCLIC HYDROGEN PHOSPHITE.
Claim 2
Dependent Claim
33 words
THE PROCESS WHICH COMPRISES REACTING IN SUBSTANTIALLY EQUAL MOLAR PROPORTIONS 2,2-DIMETHYL-1,3-PROPANEDIOL, PHOSPHORUS TRICHLORIDE AND A SATURATED ALIPHATIC ALCOHOL CONTAINING 1-8 CARBON ATOMS AT A TEMPERATURE OF 0-100*C. TO PRODUCE 2,2-DIMETHYL-1,3-PROPANEDIOL CYCLIC HYDROGEN PHOSPHITE.
References Cited (Backward Citations)
US2506344A
Cited
US2744128A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-12-07 | 1963-06-08 | 1963-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-12-07 | 1967-06-08 | 1967-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-12-07 | 1971-06-08 | 1971-12-08 | $7700.00 | Window Closed / Lapsed |