US3490739A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Azeotropic composition containing hexafluoroacetone,hydrogen fluoride,and trichlorotrifluoroethane
Assignee: WALTER R BUCKMAN
•
Filing: 1968-05-24
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Granted: 1970-01-20
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Expires: 1988-05-24
Abstract
No abstract record available.
Inventors
- 👤 Walter R Buckman
- 👤 William R Clemmons
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:53
CPC Classifications
C; C07; C07C; C07C49/00; C07C49/04; C07C49/16; C07C49/167; C07C17/00; C07C17/38; C07C19/00; C07C19/08; C07C19/10; C07C19/12; C07C45/00; C07C45/61
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2999815A
Cited
US3394878A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-01-19 | 1973-07-21 | 1974-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-19 | 1977-07-21 | 1978-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-19 | 1981-07-21 | 1982-01-20 | $7700.00 | Window Closed / Lapsed |