US2471928A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of methacrylonitrile
Assignee: Rohm and Haas Co
•
Filing: 1947-12-18
•
Granted: 1949-05-31
•
Expires: 1967-12-18
Abstract
No abstract record available.
Inventors
- 👤 Newman M Bortnick
- 👤 George W Cannon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:23
CPC Classifications
C; C07; C07C; C07C253/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2234566A
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US2328984A
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US2375005A
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US2385550A
Cited
US2417024A
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US2394430A
Cited
US2404280A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-05-30 | 1952-11-29 | 1953-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-05-30 | 1956-11-29 | 1957-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-05-30 | 1960-11-29 | 1961-05-31 | $7700.00 | Window Closed / Lapsed |