US3489649A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Double-distillation apparatus with distilland level control
Assignee: Research Corp
•
Filing: 1968-01-29
•
Granted: 1970-01-13
•
Expires: 1988-01-29
Abstract
No abstract record available.
Inventors
- 👤 Gunther Weiss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:49
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/02; C02F1/04; C02F1/045; Y; Y10; Y10S; Y10S203/00; Y10S203/19
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US698724A
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US1782959A
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US2199320A
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US2310399A
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US2606146A
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GB670439A
Cited
US2837469A
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US2662850A
Cited
US2793174A
Cited
US3326778A
Cited
US3417000A
Cited
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 |