Patent US2638833A successfully refreshed from Google Patents.
US2638833A
Expired / Lapsed
US
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Ventilator attachment for automobiles
Assignee: Individual
•
Filing: 1950-02-18
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Granted: 1953-05-19
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Expires: 1970-02-18
Abstract
No abstract record available.
Inventors
- 👤 Harry N Snyder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 03:55
CPC Classifications
B; B60; B60H; B60H1/00; B60H1/24; B60H1/26; B60H1/267
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1660893A
Cited
US1847861A
Cited
US1785891A
Cited
US1967504A
Cited
US2017996A
Cited
GB577367A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-18 | 1956-11-17 | 1957-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-18 | 1960-11-17 | 1961-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-18 | 1964-11-17 | 1965-05-19 | $7700.00 | Window Closed / Lapsed |