US2438368A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of purifying benzene
Assignee: Beazer East Inc
•
Filing: 1945-04-09
•
Granted: 1948-03-23
•
Expires: 1965-04-09
Abstract
No abstract record available.
Inventors
- 👤 William O Keeling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 03:03
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/04; C07C7/05; C07C7/06; B; B01; B01D; B01D9/00; B01D9/0004; B01D9/0009; B01D9/0059; C07C7/005; C07C7/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1677551A
Cited
US1940065A
Cited
US2218511A
Cited
US1991844A
Cited
US2360655A
Cited
US2313538A
Cited
US2356240A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-03-23 | 1951-09-22 | 1952-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-03-23 | 1955-09-22 | 1956-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-03-23 | 1959-09-22 | 1960-03-23 | $7700.00 | Window Closed / Lapsed |