Patent US2448767A successfully refreshed from Google Patents.
US2448767A
Expired / Lapsed
US
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Process of hydroxyethylation
Assignee: Mellon Institute of Industrial Research
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Filing: 1942-12-05
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Granted: 1948-09-07
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Expires: 1962-12-05
Abstract
No abstract record available.
Inventors
- 👤 Warner W Carlson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:16
CPC Classifications
C; C07; C07C; C07C43/00; C07C43/02; C07C43/20; C07C43/23; C07C29/00; C07C307/00; C07C307/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2033679A
Cited
US1817425A
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US1882808A
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US1976677A
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US1907831A
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US2051486A
Cited
DE696774C
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-09-07 | 1952-03-08 | 1952-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-09-07 | 1956-03-08 | 1956-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-09-07 | 1960-03-08 | 1960-09-07 | $7700.00 | Window Closed / Lapsed |