US2528301A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ventilating device
Assignee: Individual
•
Filing: 1945-11-24
•
Granted: 1950-10-31
•
Expires: 1965-11-24
Abstract
No abstract record available.
Inventors
- 👤 Hans H Doe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:11
CPC Classifications
F; F24; F24F; F24F7/00; F24F7/007; F24F7/013
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1695804A
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US1821202A
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US1931227A
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US1938798A
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US1924489A
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US1946887A
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US2148105A
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US2035653A
Cited
US1992112A
Cited
US2135461A
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US2081109A
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US2214467A
Cited
US2322904A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-10-30 | 1954-05-01 | 1954-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-10-30 | 1958-05-01 | 1958-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-10-30 | 1962-05-01 | 1962-10-31 | $7700.00 | Window Closed / Lapsed |