Patent US2852573A successfully refreshed from Google Patents.
US2852573A
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1, 1-difluoro-2, 2-dimethylethylene and its preparation
Assignee: Polaroid Corp
•
Filing: 1953-12-23
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Granted: 1958-09-16
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Expires: 1973-12-23
Abstract
No abstract record available.
Inventors
- 👤 Elkan R Blout
- 👤 Saul G Cohen
- 👤 Richard S Corley
- 👤 Myron S Simon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:14
CPC Classifications
C; C07; C07C; C07C21/00; C07C21/02; C07C21/18
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
1 words
1,1-DIFLUOROT-2,2-DIMETHYLETHYLENE.
Claim 2
Dependent Claim
1 words
1,1-DIFLUOROT-2,2-DIMETHYLETHYLENE.
Claim 3
Independent Claim
22 words
A METHOD OF PREPARING 1,1-DIFLUORO-2,2-DIMETHYLETHYLENE, SAID METHOD COMPRISING CATALYTICALLY EFFECTING THE HYDROGENOLYSIS OF 1,1-DIFLUORO-1-CHLORO-2-METHYL-PROPENE-2, WHEREBY ALLYLIC SHIFTING OF THE DOUBLE BOND OCCURS.
Claim 4
Independent Claim
22 words
A METHOD OF PREPARING 1,1-DIFLUORO-2,2-DIMETHYLETHYLENE, SAID METHOD COMPRISING CATALYTICALLY EFFECTING THE HYDROGENOLYSIS OF 1,1-DIFLUORO-1-CHLORO-2-METHYL-PROPENE-2, WHEREBY ALLYLIC SHIFTING OF THE DOUBLE BOND OCCURS.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-09-15 | 1962-03-17 | 1962-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-15 | 1966-03-17 | 1966-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-15 | 1970-03-17 | 1970-09-16 | $7700.00 | Window Closed / Lapsed |