US3537448A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Therapeutic intermittent positive pressure respirator
Assignee: LISTON FLETCHER Inc
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Filing: 1969-08-13
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Granted: 1970-11-03
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Expires: 1989-08-13
Abstract
No abstract record available.
Inventors
- 👤 Max D Liston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 01:49
CPC Classifications
A; A61; A61M; A61M11/00; A61M11/06; A61M15/00; A61M15/0091; A61M15/0093; A61M16/00; A61M16/0003; A61M16/0006; A61M16/08; A61M16/0816; A61M16/0841; A61M16/0858; A61M16/10; A61M16/12; A61M16/122; A61M16/125; A61M16/127; A61M16/20; A61M16/201; A61M16/207; A62; A62B; A62B15/00; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2544
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) | 1973-11-02 | 1974-05-04 | 1974-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-02 | 1978-05-04 | 1978-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-02 | 1982-05-04 | 1982-11-03 | $7700.00 | Window Closed / Lapsed |