US2484370A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid sulfoalkylene-oxyalkylene copolymers
Assignee: Shell Development Co
•
Filing: 1946-10-08
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Granted: 1949-10-11
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Expires: 1966-10-08
Abstract
No abstract record available.
Inventors
- 👤 Seaver A Ballard
- 👤 Rupert C Morris
- 👤 John L Van Winkie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:51
CPC Classifications
C; C08; C08G; C08G75/00; C08G75/12; C08G65/00; C08G65/02; C08G65/04; C08G65/06; C08G65/08; C08G75/02; C08G75/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2129709A
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FR769216A
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US2136928A
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US2149498A
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US2107366A
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US2293868A
Cited
US2326483A
Cited
US2383915A
Cited
US2434978A
Cited
US2425755A
Cited
US2425845A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-10-10 | 1953-04-11 | 1953-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-10-10 | 1957-04-11 | 1957-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-10-10 | 1961-04-11 | 1961-10-11 | $7700.00 | Window Closed / Lapsed |