Patent AT207047B successfully refreshed from Google Patents.
Patent US2379697A successfully refreshed from Google Patents.
US2379697A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of diolefins
Assignee: Shell Development Co
•
Filing: 1943-02-16
•
Granted: 1945-07-03
•
Expires: 1963-02-16
Abstract
No abstract record available.
Inventors
- 👤 Theodore W Evans
- 👤 Rupert C Morris
- 👤 Norten C Melchior
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:32
CPC Classifications
C; C07; C07C; C07C1/00; C07C1/26; C07C1/30; C07C2521/00; C07C2521/02; C07C2521/04; C07C2523/00; C07C2523/16; C07C2523/24; C07C2523/26
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1948-07-02 | 1949-01-01 | 1949-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1952-07-02 | 1953-01-01 | 1953-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1956-07-02 | 1957-01-01 | 1957-07-03 | $7700.00 | Window Closed / Lapsed |