US3469939A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for manufacturing hydrogen fluoride
Assignee: Daikin Industries Ltd
•
Filing: 1967-07-05
•
Granted: 1969-09-30
•
Expires: 1987-07-05
Abstract
No abstract record available.
Inventors
- 👤 Hiroshi Aiso
- 👤 Shunichi Nomura
- 👤 Toshinobu Takeuchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 00:04
CPC Classifications
C; C01; C01B; C01B7/00; C01B7/19; C01B7/191; C01B7/192
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1812770A
Cited
US1748735A
Cited
US2047210A
Cited
US3024123A
Cited
US3102787A
Cited
US3160473A
Cited
US3282644A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-09-29 | 1973-03-31 | 1973-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-09-29 | 1977-03-31 | 1977-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-09-29 | 1981-03-31 | 1981-09-30 | $7700.00 | Window Closed / Lapsed |