Patent US2200306A successfully refreshed from Google Patents.
US2200306A
Expired / Lapsed
US
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Compound having reactive methylene groups
Assignee: GAF Chemicals Corp
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Filing: 1938-07-21
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Granted: 1940-05-14
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Expires: 1958-07-21
Abstract
No abstract record available.
Inventors
- 👤 Schneider Wilhelm
- 👤 Frohlich Alfred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:32
CPC Classifications
C; C07; C07D; C07D261/00; C07D261/02; C07D261/06; C07D261/10; C07D261/18; C07C; C07C235/00; C07C235/70; C07C235/72; C07C235/80; C07D231/00; C07D231/02; C07D231/10; C07D231/14; C07D231/18; C07D231/20; C07D231/22; C07D231/26
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) | 1943-05-14 | 1943-11-13 | 1944-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-05-14 | 1947-11-13 | 1948-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-05-14 | 1951-11-13 | 1952-05-14 | $7700.00 | Window Closed / Lapsed |