US2998009A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Breathing apparatus
Assignee: OLD DOMINION RES AND DEV CORP
•
Filing: 1952-05-23
•
Granted: 1961-08-29
•
Expires: 1972-05-23
Abstract
No abstract record available.
Inventors
- 👤 Carl H Holm
- 👤 Iii Elihu Root
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:58
CPC Classifications
B; B63; B63C; B63C11/00; B63C11/02; B63C11/18; B63C11/22; B63C11/24; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2499; Y10T137/2506
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2603965A
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US2696731A
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US2617414A
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US2601097A
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US2693103A
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US2608200A
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US2703079A
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US2728217A
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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) | 1964-08-28 | 1965-02-27 | 1965-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-28 | 1969-02-27 | 1969-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-28 | 1973-02-27 | 1973-08-29 | $7700.00 | Window Closed / Lapsed |