Patent US4339761A successfully refreshed from Google Patents.
US2522697A
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Gas pressure operated valve and switch
Assignee: LOUIS J SCHLAEFER
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Filing: 1949-05-17
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Granted: 1950-09-19
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Expires: 1969-05-17
Abstract
No abstract record available.
Inventors
- 👤 Louis P Welch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:24
CPC Classifications
F; F16; F16K; F16K37/00; F16K37/0025; F16K37/0041; H; H01; H01H; H01H35/00; H01H35/24; H01H35/34; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7781
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US378283A
Cited
US423385A
Cited
GB190905301A
Cited
US1636919A
Cited
US1768602A
Cited
US2297917A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-09-18 | 1954-03-20 | 1954-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-09-18 | 1958-03-20 | 1958-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-09-18 | 1962-03-20 | 1962-09-19 | $7700.00 | Window Closed / Lapsed |