US2638875A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pneumatic valve control volume booster system
Assignee: Schneider Electric Systems USA Inc
•
Filing: 1952-02-12
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Granted: 1953-05-19
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Expires: 1972-02-12
Abstract
No abstract record available.
Inventors
- 👤 Hoel L Bowditch
- 👤 Allan R Catheron
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:16
CPC Classifications
F; F15; F15B; F15B21/00; F15B21/08; F15B5/00; F15B5/006; F15B2211/00; F15B2211/30; F15B2211/305; F15B2211/30505
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2240244A
Cited
US2388457A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-18 | 1956-11-17 | 1957-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-18 | 1960-11-17 | 1961-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-18 | 1964-11-17 | 1965-05-19 | $7700.00 | Window Closed / Lapsed |