Patent US1429080A successfully refreshed from Google Patents.
Patent US2569689A successfully refreshed from Google Patents.
US2569689A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ventilator
Assignee: Individual
•
Filing: 1946-04-29
•
Granted: 1951-10-02
•
Expires: 1966-04-29
Abstract
No abstract record available.
Inventors
- 👤 William H Porter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:39
CPC Classifications
F; F24; F24F; F24F13/00; F24F13/08; F24F13/082
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US481937A
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US507520A
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US797652A
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US1529573A
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US1691162A
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US2082406A
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US2170877A
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US2140049A
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US2320268A
Cited
US2328257A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-10-01 | 1955-04-02 | 1955-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-10-01 | 1959-04-02 | 1959-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-10-01 | 1963-04-02 | 1963-10-02 | $7700.00 | Window Closed / Lapsed |