US1998478A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Means for automatically flushing fluid tanks
Assignee: Individual
•
Filing: 1933-12-26
•
Granted: 1935-04-23
•
Expires: 1953-12-26
Abstract
No abstract record available.
Inventors
- 👤 Walter W Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:38
CPC Classifications
E; E03; E03D; E03D1/00; E03D1/02; E03D1/16; Y; Y10; Y10T; Y10T137/00; Y10T137/2931; Y10T137/2937; Y10T137/2947; Y10T137/2956; Y10T137/2959; Y10T137/7287; Y10T137/7303; Y10T137/7313; Y10T137/7316; Y10T137/7319; Y10T137/7358; Y10T137/7381; Y10T137/7387; Y10T137/7394
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) | 1938-04-22 | 1938-10-22 | 1939-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1942-04-22 | 1942-10-22 | 1943-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1946-04-22 | 1946-10-22 | 1947-04-23 | $7700.00 | Window Closed / Lapsed |