US2209431A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Humidifier for mechanical refrigerators
Assignee: Westinghouse Electric Corp
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Filing: 1938-10-19
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Granted: 1940-07-30
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Expires: 1958-10-19
Abstract
No abstract record available.
Inventors
- 👤 Tull Robert Harrell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:18
CPC Classifications
F; F25; F25D; F25D17/00; F25D17/04; F25D17/06; F25D17/062; F25D21/00; F25D21/14; F25D2317/00; F25D2317/04; F25D2317/041; F25D2317/0413; F25D2317/06; F25D2317/065; F25D2317/0651; F25D2317/066; F25D2317/0665; F25D2317/068; F25D2317/0683; F25D2321/00; F25D2321/14; F25D2321/146
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) | 1943-07-30 | 1944-01-29 | 1944-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-07-30 | 1948-01-29 | 1948-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-07-30 | 1952-01-29 | 1952-07-30 | $7700.00 | Window Closed / Lapsed |