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US2768261A
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Explosion protection systems and apparatus therefor
Assignee: Graviner Manufacturing Co Ltd
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Filing: 1954-02-02
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Granted: 1956-10-23
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Expires: 1974-02-02
Abstract
No abstract record available.
Inventors
- 👤 Mathisen Anders
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:37
CPC Classifications
A; A62; A62C; A62C99/00; A62C99/009; G; G08; G08B; G08B17/00; G08B17/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR644641A
Cited
GB221504A
Cited
US2091300A
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US2267541A
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US2445335A
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US2637999A
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US2632474A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-10-23 | 1960-04-23 | 1960-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-10-23 | 1964-04-23 | 1964-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-10-23 | 1968-04-23 | 1968-10-23 | $7700.00 | Window Closed / Lapsed |