US2415411A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and apparatus for high vacuum distillation
Assignee: Gulf Research and Development Co
•
Filing: 1942-03-30
•
Granted: 1947-02-11
•
Expires: 1962-03-30
Abstract
No abstract record available.
Inventors
- 👤 John R Bowman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:54
CPC Classifications
B; B01; B01D; B01D3/00; B01D3/10; Y; Y10; Y10S; Y10S159/00; Y10S159/01; Y10S203/00; Y10S203/11
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) | 1950-02-10 | 1950-08-12 | 1951-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-02-10 | 1954-08-12 | 1955-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-02-10 | 1958-08-12 | 1959-02-11 | $7700.00 | Window Closed / Lapsed |