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Patent US2434683A successfully refreshed from Google Patents.
US2434683A
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Surface active compositions
Assignee: Shell Development Co
•
Filing: 1944-08-03
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Granted: 1948-01-20
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Expires: 1964-08-03
Abstract
No abstract record available.
Inventors
- 👤 Buis Marinus
- 👤 Samuel Dillwyn Morgan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:26
CPC Classifications
C; C11; C11D; C11D1/00; C11D1/02; C11D1/12; C11D1/14; C11D1/146; Y; Y10; Y10S; Y10S516/00; Y10S516/01; Y10S516/03
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2061619A
Cited
GB352989A
Cited
GB423238A
Cited
US2111911A
Cited
US2091123A
Cited
US2082576A
Cited
GB496209A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-01-19 | 1951-07-21 | 1952-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-01-19 | 1955-07-21 | 1956-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-01-19 | 1959-07-21 | 1960-01-20 | $7700.00 | Window Closed / Lapsed |