US2972876A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-cleaning filter structure
Assignee: Whirlpool Corp
•
Filing: 1957-05-20
•
Granted: 1961-02-28
•
Expires: 1977-05-20
Abstract
No abstract record available.
Inventors
- 👤 Geldhof Peter Eduard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:19
CPC Classifications
D; D06; D06F; D06F39/00; D06F39/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2270750A
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US2509753A
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US2554229A
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US2481979A
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US2681153A
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US2695133A
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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) | 1964-02-28 | 1964-08-29 | 1965-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-02-28 | 1968-08-29 | 1969-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-02-28 | 1972-08-29 | 1973-02-28 | $7700.00 | Window Closed / Lapsed |