US2469288A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acetal resins
Assignee: Shell Development Co
•
Filing: 1943-09-20
•
Granted: 1949-05-03
•
Expires: 1963-09-20
Abstract
No abstract record available.
Inventors
- 👤 David E Adelson
- 👤 Jr Harold F Gray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:52
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/28
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2124630A
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US2197357A
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US2273891A
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US2318959A
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US2332895A
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US2332900A
Cited
US2386999A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-05-02 | 1952-11-01 | 1953-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-05-02 | 1956-11-01 | 1957-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-05-02 | 1960-11-01 | 1961-05-03 | $7700.00 | Window Closed / Lapsed |