Patent US1638738A successfully refreshed from Google Patents.
US1638738A
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US
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Ventilator outtake flue
Assignee: LICHTY METAL PRODUCTS Co
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Filing: 1926-01-29
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Granted: 1927-08-09
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Expires: 1946-01-29
Abstract
No abstract record available.
Inventors
- 👤 Norman A Lichty
- 👤 Charles L Ostrander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 02:02
CPC Classifications
F; F23; F23L; F23L17/00; F23L17/02; F23L17/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1930-08-08 | 1931-02-07 | 1931-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1934-08-08 | 1935-02-07 | 1935-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1938-08-08 | 1939-02-07 | 1939-08-09 | $7700.00 | Window Closed / Lapsed |