US2320567A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Internal safety valve system
Assignee: Individual
•
Filing: 1941-09-02
•
Granted: 1943-06-01
•
Expires: 1961-09-02
Abstract
No abstract record available.
Inventors
- 👤 Samuel E Carlson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:14
CPC Classifications
F; F16; F16K; F16K31/00; F16K31/44; F16K31/46; F16K31/465; Y; Y10; Y10T; Y10T137/00; Y10T137/1624; Y10T137/1797; Y10T137/1804; Y10T137/1842; Y10T137/1939; Y10T137/1963; Y10T137/1987; Y10T137/6851; Y10T137/6855; Y10T137/6881; Y10T137/8593; Y10T137/87096; Y10T74/00; Y10T74/19; Y10T74/19219; Y10T74/19242; Y10T74/19247; Y10T74/20; Y10T74/20396; Y10T74/20402; Y10T74/2042; Y10T74/20426
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) | 1946-05-31 | 1946-11-30 | 1947-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1950-05-31 | 1950-11-30 | 1951-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1954-05-31 | 1954-11-30 | 1955-06-01 | $7700.00 | Window Closed / Lapsed |