Patent US4301508A successfully refreshed from Google Patents.
Patent US2171973A successfully refreshed from Google Patents.
US2171973A
Expired / Lapsed
US
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Safety device for pressure vessels
Assignee: Dominion Oxygen Co Ltd
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Filing: 1936-08-31
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Granted: 1939-09-05
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Expires: 1956-08-31
Abstract
No abstract record available.
Inventors
- 👤 Debor Hermann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:46
CPC Classifications
F; F17; F17C; F17C13/00; F17C13/12; F17C13/123; F17C1/00; F17C2201/00; F17C2201/01; F17C2201/0128; F17C2201/0147; F17C2201/0166; F17C2201/0171; F17C2201/05; F17C2201/056; F17C2201/058; F17C2203/00; F17C2203/06; F17C2203/0602; F17C2203/0612; F17C2203/0614; F17C2203/0617; F17C2203/0634; F17C2203/0636; F17C2205/00; F17C2205/01; F17C2205/0123; F17C2205/013; F17C2205/0134; F17C2205/0138; F17C2205/03; F17C2205/0302; F17C2205/0338; F17C2205/035; F17C2209/00; F17C2209/22; F17C2209/221; F17C2223/00; F17C2223/03; F17C2223/035; F17C2260/00; F17C2260/03; F17C2260/035; F17C2260/04; F17C2260/042
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) | 1942-09-04 | 1943-03-06 | 1943-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-09-04 | 1947-03-06 | 1947-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-09-04 | 1951-03-06 | 1951-09-05 | $7700.00 | Window Closed / Lapsed |