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US2487933A
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Boiler high and low water control and alarm system
Assignee: WILLIAM O MARTIN Inc
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Filing: 1945-07-30
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Granted: 1949-11-15
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Expires: 1965-07-30
Abstract
No abstract record available.
Inventors
- 👤 William O Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 00:22
CPC Classifications
F; F22; F22B; F22B37/00; F22B37/02; F22B37/42; F22B37/426; Y; Y10; Y10T; Y10T137/00; Y10T137/7287; Y10T137/7358; Y10T137/7368
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-11-14 | 1953-05-16 | 1953-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-11-14 | 1957-05-16 | 1957-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-11-14 | 1961-05-16 | 1961-11-15 | $7700.00 | Window Closed / Lapsed |