Patent US2369640A successfully refreshed from Google Patents.
US2369640A
Expired / Lapsed
US
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Anticorrosive
Assignee: Shell Development Co
•
Filing: 1943-02-08
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Granted: 1945-02-20
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Expires: 1963-02-08
Abstract
No abstract record available.
Inventors
- 👤 Emmett R Barnum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:10
CPC Classifications
C; C10; C10L; C10L1/00; C10L1/10; C10L1/14; C10L1/18; C10L1/188; C09; C09D; C09D5/00; C09D5/08; C09D5/082; C09D5/086; C23; C23F; C23F11/00; C23F11/08; C23F11/10; C23F11/12; C23F11/124
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) | 1948-02-20 | 1948-08-21 | 1949-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1952-02-20 | 1952-08-21 | 1953-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1956-02-20 | 1956-08-21 | 1957-02-20 | $7700.00 | Window Closed / Lapsed |