Patent US2537495A successfully refreshed from Google Patents.
US2537495A
Expired / Lapsed
US
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Air humidifier for internalcombustion engines
Assignee: JOHN T JOHNSON
•
Filing: 1947-08-13
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Granted: 1951-01-09
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Expires: 1967-08-13
Abstract
No abstract record available.
Inventors
- 👤 Horace C Wallin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:05
CPC Classifications
F; F02; F02M; F02M35/00; F02M35/02; F02M35/04; F02M35/042; F02M25/00; F02M25/022; F02M25/0221; F02M25/0225; F02M25/025; F02M25/028; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-01-08 | 1954-07-10 | 1955-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-08 | 1958-07-10 | 1959-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-08 | 1962-07-10 | 1963-01-09 | $7700.00 | Window Closed / Lapsed |