Patent US1978128A successfully refreshed from Google Patents.
US1978128A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vortex control
Assignee: CLARAGE FAN CO
•
Filing: 1932-03-14
•
Granted: 1934-10-23
•
Expires: 1952-03-14
Abstract
No abstract record available.
Inventors
- 👤 Seweil H Downs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:18
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/40; F04D29/42; F04D29/44; F04D29/46; F04D29/462; F04D29/4206; F04D29/4213; F05; F05D; F05D2250/00; F05D2250/50; F05D2250/51
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1937-10-22 | 1938-04-23 | 1938-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1941-10-22 | 1942-04-23 | 1942-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1945-10-22 | 1946-04-23 | 1946-10-23 | $7700.00 | Window Closed / Lapsed |