US3129707A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Breathing apparatus
Assignee: MSA Safety Inc
•
Filing: 1954-11-12
•
Granted: 1964-04-21
•
Expires: 1974-11-12
Abstract
No abstract record available.
Inventors
- 👤 Earl M Becker
- 👤 John J Bridge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:25
CPC Classifications
A; A62; A62B; A62B9/00; A62B9/02; B; B63; B63C; B63C11/00; B63C11/02; B63C11/18; B63C11/22; B63C11/2245
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US7476A
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US575840A
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GB190513604A
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US1088817A
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US1330798A
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GB542955A
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US2403991A
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US2348074A
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US2362643A
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US2362240A
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US2402984A
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US2456130A
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US2444029A
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US2814291A
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US2792828A
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US2758596A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-04-21 | 1967-10-21 | 1968-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-04-21 | 1971-10-21 | 1972-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-04-21 | 1975-10-21 | 1976-04-21 | $7700.00 | Window Closed / Lapsed |