US2458324A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ventilator
Assignee: Individual
•
Filing: 1945-01-01
•
Granted: 1949-01-04
•
Expires: 1965-01-01
Abstract
No abstract record available.
Inventors
- 👤 Maurice C Volkmann
- 👤 Clarence A Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:02
CPC Classifications
F; F24; F24F; F24F13/00; F24F13/08; F24F13/10; F24F13/14; F24F13/1426; F24F13/1413
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US600975A
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US793982A
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US932659A
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US1070312A
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US1071729A
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US1128166A
Cited
US1389788A
Cited
US1575126A
Cited
US1670784A
Cited
US1742185A
Cited
US2089060A
Cited
US2372164A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-01-04 | 1952-07-05 | 1953-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-01-04 | 1956-07-05 | 1957-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-01-04 | 1960-07-05 | 1961-01-04 | $7700.00 | Window Closed / Lapsed |