Patent US2808425A successfully refreshed from Google Patents.
US2808425A
Expired / Lapsed
US
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Substitution products of polyfluoroolefins and processes for the preparation thereof
Assignee: Individual
•
Filing: 1953-08-31
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Granted: 1957-10-01
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Expires: 1973-08-31
Abstract
No abstract record available.
Inventors
- 👤 Haszeldinc Robert Neville
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:50
CPC Classifications
C; C07; C07C; C07C17/00; C07C17/07; C07C17/087; C07C17/093; C07C17/361; C07C17/363; C07C21/00; C07C21/02; C07C21/18; C07C23/00; C07C23/02; C07C23/10; C07C57/00; C07C57/52
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
6 words
CHEMICAL COMPOUNDS OF THE GENERAL FORMULA:
Claim 2
Dependent Claim
6 words
CHEMICAL COMPOUNDS OF THE GENERAL FORMULA:
References Cited (Backward Citations)
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Cited
US2409124A
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US2446124A
Cited
US2472812A
Cited
US2560838A
Cited
US2506068A
Cited
US2554219A
Cited
US2704769A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-30 | 1961-04-01 | 1961-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-30 | 1965-04-01 | 1965-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-30 | 1969-04-01 | 1969-10-01 | $7700.00 | Window Closed / Lapsed |