US3159663A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing amino-substituted sulfate esters
Assignee: Pure Oil Co
•
Filing: 1961-05-04
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Granted: 1964-12-01
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Expires: 1981-05-04
Abstract
No abstract record available.
Inventors
- 👤 Donald L Klass
- 👤 John E King
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:10
CPC Classifications
C; C07; C07C; C07C305/00; C07C305/02; C07C305/04; C07C305/06; C07C2603/00; C07C2603/02; C07C2603/04; C07C2603/22; C07C2603/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
16 words
A METHOD OF PREPARIG AMINE-SUBSTITUTED SULFATE ESTERS WHICH COMRPISES REACTING A SULFATE ESTER OF THE FORMULA
Claim 2
Independent Claim
16 words
A METHOD OF PREPARIG AMINE-SUBSTITUTED SULFATE ESTERS WHICH COMRPISES REACTING A SULFATE ESTER OF THE FORMULA
References Cited (Backward Citations)
US2666788A
Cited
US2923728A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-12-01 | 1968-06-01 | 1968-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-12-01 | 1972-06-01 | 1972-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-12-01 | 1976-06-01 | 1976-12-01 | $7700.00 | Window Closed / Lapsed |