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US2489228A
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US
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Ship protection
Assignee: Shell Development Co
•
Filing: 1945-01-23
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Granted: 1949-11-22
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Expires: 1965-01-23
Abstract
No abstract record available.
Inventors
- 👤 Rudd Herbert William
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:31
CPC Classifications
C; C09; C09D; C09D195/00; C09D195/005; C09D5/00; C09D5/16; C09D5/1687; Y; Y10; Y10S; Y10S260/00; Y10S260/47; Y10S428/00; Y10S428/907
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1733493A
Cited
GB381286A
Cited
US1988175A
Cited
US2190604A
Cited
GB514818A
Cited
US2256886A
Cited
US2364460A
Cited
US2326610A
Cited
US2382337A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-11-21 | 1953-05-23 | 1953-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-11-21 | 1957-05-23 | 1957-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-11-21 | 1961-05-23 | 1961-11-22 | $7700.00 | Window Closed / Lapsed |