Patent US2272498A successfully refreshed from Google Patents.
US2272498A
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Process for producing compounds of the diaryl series
Assignee: GAF Chemicals Corp
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Filing: 1940-02-03
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Granted: 1942-02-10
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Expires: 1960-02-03
Abstract
No abstract record available.
Inventors
- 👤 Zerweck Werner
- 👤 Ritter Heinrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:47
CPC Classifications
C; C07; C07C; C07C2/00; C07C2/86; C07C17/00; C07C17/26; C07C17/263; C07C201/00; C07C201/06; C07C201/12; C09; C09B; C09B19/00; C07C2603/00; C07C2603/02; C07C2603/04; C07C2603/22; C07C2603/26
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1945-02-09 | 1945-08-11 | 1946-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1949-02-09 | 1949-08-11 | 1950-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1953-02-09 | 1953-08-11 | 1954-02-10 | $7700.00 | Window Closed / Lapsed |