Patent US1750047A successfully refreshed from Google Patents.
US1750047A
Expired / Lapsed
US
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Air-cooling apparatus
Assignee: Individual
•
Filing: 1928-05-31
•
Granted: 1930-03-11
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Expires: 1948-05-31
Abstract
No abstract record available.
Inventors
- 👤 Gustave A Metzger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:44
CPC Classifications
F; F24; F24F; F24F6/00; F24F6/02; F24F6/04; Y; Y10; Y10S; Y10S160/00; Y10S160/90
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) | 1933-03-10 | 1933-09-09 | 1934-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1937-03-10 | 1937-09-09 | 1938-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1941-03-10 | 1941-09-09 | 1942-03-11 | $7700.00 | Window Closed / Lapsed |