US1971090A
Expired / Lapsed
US
⏱️ 0.0 years remaining
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Assignee: Individual
•
Filing: 1931-12-30
•
Granted: 1934-08-21
•
Expires: 1951-12-30
Abstract
No abstract record available.
Inventors
- 👤 Zwicky Jean
- 👤 Royal Farnham
- 👤 Hunt William Francis
- 👤 Tyler Sydney Albert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 04:33
CPC Classifications
B; B01; B01D; B01D35/00; B01D35/16; B01D29/00; B01D29/11; B01D29/13; B01D29/15; B01D29/62; B01D29/66; B01D2201/00; B01D2201/04; B01D2201/0461
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1937-08-20 | 1938-02-19 | 1938-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1941-08-20 | 1942-02-19 | 1942-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1945-08-20 | 1946-02-19 | 1946-08-21 | $7700.00 | Window Closed / Lapsed |