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US3489651A
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Distillation apparatus utilizing frictional heating and compression of vapors
Assignee: Whirlpool Corp
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Filing: 1966-07-07
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Granted: 1970-01-13
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Expires: 1986-07-07
Abstract
No abstract record available.
Inventors
- 👤 Laddie A De Pas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:20
CPC Classifications
B; B01; B01D; B01D1/00; B01D1/28; B01D1/2887; B01D1/22; B01D1/222; B01D1/223; Y; Y10; Y10S; Y10S203/00; Y10S203/11
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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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) | 1973-01-12 | 1973-07-14 | 1974-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-12 | 1977-07-14 | 1978-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-12 | 1981-07-14 | 1982-01-13 | $7700.00 | Window Closed / Lapsed |