Patent US2398481A successfully refreshed from Google Patents.
US2398481A
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US
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Process for catalyzed abnormal addition reactions
Assignee: Shell Development Co
•
Filing: 1942-02-23
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Granted: 1946-04-16
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Expires: 1962-02-23
Abstract
No abstract record available.
Inventors
- 👤 William E Vaughan
- 👤 Frederick F Rust
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:10
CPC Classifications
C; C07; C07C; C07C17/00; C07C17/07; C07C17/08; C07C319/00; C07C319/02; C07C319/04; C07C319/14; C07C319/16; Y; Y10; Y10S; Y10S204/00; Y10S204/902; Y10S204/912
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) | 1949-04-15 | 1949-10-15 | 1950-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1953-04-15 | 1953-10-15 | 1954-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1957-04-15 | 1957-10-15 | 1958-04-16 | $7700.00 | Window Closed / Lapsed |