US3501268A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of anhydrous hydrogen fluoride
Assignee: Ethyl Corp
•
Filing: 1967-05-18
•
Granted: 1970-03-17
•
Expires: 1987-05-18
Abstract
No abstract record available.
Inventors
- 👤 Roy J Laran
- 👤 Albert P Giraitis
- 👤 Paul Kobetz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:12
CPC Classifications
C; C01; C01B; C01B7/00; C01B7/19; C01B7/191
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB423601A
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GB425908A
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GB635553A
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GB782423A
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US2916352A
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US3005684A
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US2981601A
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US2981597A
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US3057681A
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US3128152A
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US3195979A
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US3175882A
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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) | 1973-03-16 | 1973-09-15 | 1974-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-03-16 | 1977-09-15 | 1978-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-03-16 | 1981-09-15 | 1982-03-17 | $7700.00 | Window Closed / Lapsed |