Patent US2287433A successfully refreshed from Google Patents.
US2287433A
Expired / Lapsed
US
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System for safeguarding the operation of steam boilers
Assignee: Crosby Steam Gage & Valve Co
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Filing: 1938-03-21
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Granted: 1942-06-23
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Expires: 1958-03-21
Abstract
No abstract record available.
Inventors
- 👤 Klafstad Erling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:56
CPC Classifications
F; F22; F22B; F22B37/00; F22B37/02; F22B37/42; F22B37/44; F22B37/446; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7737
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1945-06-22 | 1945-12-22 | 1946-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1949-06-22 | 1949-12-22 | 1950-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1953-06-22 | 1953-12-22 | 1954-06-23 | $7700.00 | Window Closed / Lapsed |