Patent US3131189A successfully refreshed from Google Patents.
US3131189A
Expired / Lapsed
US
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Preparation of quaternary ammonium betaine salts
Assignee: Pure Oil Co
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Filing: 1961-10-16
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Granted: 1964-04-28
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Expires: 1981-10-16
Abstract
No abstract record available.
Inventors
- 👤 Donald L Klass
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:09
CPC Classifications
C; C07; C07D; C07D213/00; C07D213/02; C07D213/04; C07D213/06; C07D213/16; C07D213/20; C07D215/00; C07D215/02; C07D215/04; C07D215/10; C07D219/00; C07D219/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
9 words
THE METHOD OF PREPARING BETAINE SALTS OF THE FORMULA
Claim 2
Independent Claim
9 words
THE METHOD OF PREPARING BETAINE SALTS OF THE FORMULA
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-04-28 | 1967-10-28 | 1968-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-04-28 | 1971-10-28 | 1972-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-04-28 | 1975-10-28 | 1976-04-28 | $7700.00 | Window Closed / Lapsed |