Patent US2737530A successfully refreshed from Google Patents.
US2737530A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Unsaturated fluoro ethers and fluoro ortho esters and their production
Assignee: Dow Chemical Co
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Filing: 1950-06-02
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Granted: 1956-03-06
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Expires: 1970-06-02
Abstract
No abstract record available.
Inventors
- 👤 Robert P Ruh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:54
CPC Classifications
C; C07; C07C; C07C43/00; C07C43/02; C07C43/03; C07C43/14
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
123 words
A METHOD OF PRODUCING A FLUORO-SUBSTITUTED ORTHO ESTER WHICH COMPRISES MIXING TOGETHER (A) ONE MOLE OF A HALO-1.2-DIFLUOROETHYLENE CONTAINING ONLY TWO CARBON ATOMS AND TWO FLUORINE ATOMS PER MOLECULE AND CONTAINING FROM ONE TO TWO HALOGENS OF ATOMIC WEIGHT BETWEEN 35 AND 80, (B) AT LEAST THREE MOLS OF AN ACYCLIC MONOHYDROXYHYDROCARBON HAVING NOT MORE THAN FOUR CARBON ATOMS, AND (C) FROM TWO TO FOUR MOLS OF A BASE OF THE GROUP CONSISTING OF ALKALI METAL HYDROXIDES, ALKALI METALS, AND ALKALI METAL SALTS OF ACYCLIC MONOHYDROXYHYDROCARBONS HAVING NOT MORE THAN FOUR CARBON ATOMS, MAINTAINING THE MIXTURE AT A TEMPERATURE BETWEEN 20* AND 120* C. FOR A TIME SUFFICIENT TO INSURE SUBSTANTIAL REACTION, AND SEPARATING THE RESULTING FLUORO-SUBSTITUTED ORTHO ESTER FROM THE REACTION PRODUCT.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-03-06 | 1959-09-05 | 1960-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-03-06 | 1963-09-05 | 1964-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-03-06 | 1967-09-05 | 1968-03-06 | $7700.00 | Window Closed / Lapsed |