Patent FR614873A successfully refreshed from Google Patents.
Patent US2368665A successfully refreshed from Google Patents.
US2368665A
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US
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Distillation method and apparatus
Assignee: AT&T Inc
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Filing: 1942-12-17
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Granted: 1945-02-06
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Expires: 1962-12-17
Abstract
No abstract record available.
Inventors
- 👤 Girard T Kohman
- 👤 Jr Charles H Prescott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:10
CPC Classifications
B; B01; B01D; B01D3/00; B01D3/34; B01D3/343; B01D3/346; Y; Y10; Y10S; Y10S203/00; Y10S203/18
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) | 1948-02-06 | 1948-08-07 | 1949-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1952-02-06 | 1952-08-07 | 1953-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1956-02-06 | 1956-08-07 | 1957-02-06 | $7700.00 | Window Closed / Lapsed |