US2231936A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carbonic acid ester of 1,2 di-(parahydroxyphenyl) 1,2-diethyl ethylene
Assignee: Winthrop Chemical Co Inc
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Filing: 1940-02-03
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Granted: 1941-02-18
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Expires: 1960-02-03
Abstract
No abstract record available.
Inventors
- 👤 Medick Heinrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:09
CPC Classifications
C; C07; C07C; C07C39/00; C07C39/205; C07C39/21; C07C39/215; C07C68/00; C07C68/02; C09; C09B; C09B55/00; C09B69/00; C09B69/02; C09B69/04
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) | 1944-02-18 | 1944-08-19 | 1945-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-02-18 | 1948-08-19 | 1949-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-02-18 | 1952-08-19 | 1953-02-18 | $7700.00 | Window Closed / Lapsed |