US2189383A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Facilitating friedel-crafts reactions
Assignee: Armour and Co
•
Filing: 1939-02-13
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Granted: 1940-02-06
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Expires: 1959-02-13
Abstract
No abstract record available.
Inventors
- 👤 Anderson W Ralston
- 👤 Wal Robert J Vander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:05
CPC Classifications
C; C07; C07D; C07D311/00; C07D311/02; C07D311/04; C07D311/06; C07D311/08; B; B61; B61F; B61F15/00; B61F15/20; B61F15/26; C07C; C07C45/00; C07C45/45; C07C45/46
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) | 1943-02-05 | 1943-08-07 | 1944-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-02-05 | 1947-08-07 | 1948-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-02-05 | 1951-08-07 | 1952-02-06 | $7700.00 | Window Closed / Lapsed |