US3469937A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of synthetic cryolite by fluidized dry process
Assignee: Reynolds Metals Co
•
Filing: 1966-04-19
•
Granted: 1969-09-30
•
Expires: 1986-04-19
Abstract
No abstract record available.
Inventors
- 👤 Richard C Roberts
- 👤 James F Kane
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 18:21
CPC Classifications
C; C01; C01F; C01F7/00; C01F7/48; C01F7/50; C01F7/54
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
CA505199A
Cited
US1937885A
Cited
US2996354A
Cited
US3057680A
Cited
US3063799A
Cited
FR1309300A
Cited
US3323861A
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 |