US3712918A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Amphoteric surface-active agents
Assignee: Stepan Co
•
Filing: 1972-05-31
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Granted: 1973-01-23
•
Expires: 1992-05-31
Abstract
Abstract THIS INVENTION RELATES TO AMPHOTERIC SURFACE-ACTIVE AGENTS HAVING THE GENERAL STRUCTURE: R-CH(-CH3)-N(-R'')-CH2-CH2-COO-M WHEREIN R IS A STRAIGHT CHAIN ALKYL HAVING FROM 6 TO 16 CARBON ATOMS, R'' IS A LOWER ALKYL, AND M IS EITHER HYDROGEN, AN ALKALI METAL OR AN ALKYLOLAMINE.
Inventors
- 👤 Z Dudzinski
- 👤 R Wakeman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 01:18
CPC Classifications
C; C07; C07C; C07C255/00; C07C291/00; C07C291/02; C07C291/04; Y; Y10; Y10S; Y10S516/00; Y10S516/01; Y10S516/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3287411A
Cited
US3647868A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-23 | 1976-07-24 | 1977-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-23 | 1980-07-24 | 1981-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-23 | 1984-07-24 | 1985-01-23 | $7700.00 | Window Closed / Lapsed |