US2431715A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Prevention of corrosion in hydrogen fluoride catalytic organic reactions
Assignee: Shell Development Co
•
Filing: 1944-01-14
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Granted: 1947-12-02
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Expires: 1964-01-14
Abstract
No abstract record available.
Inventors
- 👤 Wachter Aaron
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:33
CPC Classifications
B; B01; B01J; B01J19/00; B01J19/02; B01J19/0006; B01J19/002; C; C07; C07C; C07C2/00; C07C2/54; C07C2/56; C07C2/58; C07C2/62; B01J2219/00; B01J2219/02; B01J2219/0204; C07C2527/00; C07C2527/06; C07C2527/08; C07C2527/12; C07C2527/1206
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-12-01 | 1951-06-02 | 1951-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-12-01 | 1955-06-02 | 1955-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-12-01 | 1959-06-02 | 1959-12-02 | $7700.00 | Window Closed / Lapsed |