US2990852A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pneumatic pressure switch
Assignee: Specialties Development Corp
•
Filing: 1958-11-06
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Granted: 1961-07-04
•
Expires: 1978-11-06
Abstract
No abstract record available.
Inventors
- 👤 Alfred W Siman
- 👤 William A V Thomsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:44
CPC Classifications
F; F16; F16K; F16K31/00; F16K31/12; F16K31/36; F16K31/365; Y; Y10; Y10T; Y10T137/00; Y10T137/6851; Y10T137/6966; Y10T137/6969; Y10T137/698; Y10T137/6984; Y10T137/6991; Y10T137/6995; Y10T137/701; Y10T137/8593; Y10T137/86919; Y10T137/87169; Y10T137/87217; Y10T137/87225
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2185099A
Cited
GB521728A
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US2247520A
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US2377227A
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US2409220A
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US2470372A
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US2434262A
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US2589019A
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US2629363A
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US2699180A
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US2797701A
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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) | 1964-07-03 | 1965-01-02 | 1965-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-03 | 1969-01-02 | 1969-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-03 | 1973-01-02 | 1973-07-04 | $7700.00 | Window Closed / Lapsed |