Patent US2971990A successfully refreshed from Google Patents.
US2971990A
Expired / Lapsed
US
⏱️ 0.0 years remaining
2-bromo-1, 1, 1, 2-tetrafluoroethane
Assignee: Dow Chemical Co
•
Filing: 1957-09-25
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Granted: 1961-02-14
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Expires: 1977-09-25
Abstract
No abstract record available.
Inventors
- 👤 Eric R Larsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:30
CPC Classifications
C; C07; C07C; C07C19/00; C07C19/08; C07C19/14; C07C17/00; C07C17/093; C07C17/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
1 words
2-BROMO-1,1,1,2-TETRAFLUOROETHANE.
Claim 2
Dependent Claim
1 words
2-BROMO-1,1,1,2-TETRAFLUOROETHANE.
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) | 1964-02-14 | 1964-08-15 | 1965-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-02-14 | 1968-08-15 | 1969-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-02-14 | 1972-08-15 | 1973-02-14 | $7700.00 | Window Closed / Lapsed |