US2536089A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for automatic regulation of fluid pressure
Assignee: Individual
•
Filing: 1948-03-19
•
Granted: 1951-01-02
•
Expires: 1968-03-19
Abstract
No abstract record available.
Inventors
- 👤 William P Ratchford
- 👤 Martin L Fein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:14
CPC Classifications
G; G05; G05D; G05D16/00; G05D16/20; G05D16/2093; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7758; Y10T137/7761
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US372361A
Cited
US400267A
Cited
US2108338A
Cited
US2232840A
Cited
US2235123A
Cited
US2268154A
Cited
US2421292A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-01-01 | 1954-07-03 | 1955-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-01 | 1958-07-03 | 1959-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-01 | 1962-07-03 | 1963-01-02 | $7700.00 | Window Closed / Lapsed |