US2021053A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid pressure regulation system
Assignee: Individual
•
Filing: 1932-08-22
•
Granted: 1935-11-12
•
Expires: 1952-08-22
Abstract
No abstract record available.
Inventors
- 👤 Englebright Alfred Eugene
- 👤 Violette William A La
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 18:32
CPC Classifications
G; G05; G05D; G05D16/00; G05D16/14; G05D16/16; G05D16/163; G05D16/04; G05D16/06; G05D16/063; G05D16/0675; G05D16/0683; G05D16/0686; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7758; Y10T137/7759; Y10T137/7762; Y10T137/7764; Y10T137/7781; Y10T137/7793; Y10T137/7805
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) | 1938-11-11 | 1939-05-13 | 1939-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1942-11-11 | 1943-05-13 | 1943-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1946-11-11 | 1947-05-13 | 1947-11-12 | $7700.00 | Window Closed / Lapsed |