Patent US2446880A successfully refreshed from Google Patents.
US2446880A
Expired / Lapsed
US
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Distillation and heat exchange apparatus
Assignee: Arthur D Little Inc
•
Filing: 1941-06-28
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Granted: 1948-08-10
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Expires: 1961-06-28
Abstract
No abstract record available.
Inventors
- 👤 Robert V Kleinschmidt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:40
CPC Classifications
B; B01; B01D; B01D1/00; B01D1/28; B01D1/289; B01D1/02; B01D1/2803; B01D1/2818
Claims Analysis
Total Claims: 0
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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) | 1951-08-10 | 1952-02-09 | 1952-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-08-10 | 1956-02-09 | 1956-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-08-10 | 1960-02-09 | 1960-08-10 | $7700.00 | Window Closed / Lapsed |