US2811840A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filtered duct in refrigerator
Assignee: Individual
•
Filing: 1954-04-01
•
Granted: 1957-11-05
•
Expires: 1974-04-01
Abstract
No abstract record available.
Inventors
- 👤 Arthur M Thompson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:34
CPC Classifications
F; F25; F25D; F25D23/00; F25D23/003; F25D2323/00; F25D2323/002; F25D2323/0024; F25D2323/0026; F25D2323/00261; F25D2323/00264; F25D2323/0027; F25D2323/00272
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1716481A
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US1926433A
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US2254604A
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US2324620A
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US2286491A
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US2483540A
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US2612705A
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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) | 1960-11-04 | 1961-05-06 | 1961-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-11-04 | 1965-05-06 | 1965-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-11-04 | 1969-05-06 | 1969-11-05 | $7700.00 | Window Closed / Lapsed |