US2543566A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety valve for gas lines
Assignee: Individual
•
Filing: 1948-03-17
•
Granted: 1951-02-27
•
Expires: 1968-03-17
Abstract
No abstract record available.
Inventors
- 👤 David L Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:47
CPC Classifications
F; F16; F16K; F16K17/00; F16K17/20; F16K17/22; F16K17/32; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7723; Y10T137/7726; Y10T137/7727; Y10T137/7758; Y10T137/7759; Y10T137/8593; Y10T137/86493; Y10T137/87265; Y10T137/87499; Y10T137/877; Y10T137/87829; Y10T137/87837; Y10T137/87917; Y10T137/88062
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-02-26 | 1954-08-28 | 1955-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-26 | 1958-08-28 | 1959-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-26 | 1962-08-28 | 1963-02-27 | $7700.00 | Window Closed / Lapsed |