US3443902A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chlorine purification
Assignee: Lummus Technology LLC
•
Filing: 1966-08-05
•
Granted: 1969-05-13
•
Expires: 1986-08-05
Abstract
No abstract record available.
Inventors
- 👤 Utah Tsao
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:05
CPC Classifications
C; C01; C01B; C01B7/00; C01B7/01; C01B7/07; C01B7/0743
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1913628A
Cited
US2318512A
Cited
US2547928A
Cited
US2700431A
Cited
US2822889A
Cited
GB934394A
Cited
US3230724A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-05-12 | 1972-11-11 | 1973-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-05-12 | 1976-11-11 | 1977-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-05-12 | 1980-11-11 | 1981-05-13 | $7700.00 | Window Closed / Lapsed |