US2958682A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing a polymeric betaine
Assignee: Wyeth Holdings LLC
•
Filing: 1955-04-27
•
Granted: 1960-11-01
•
Expires: 1975-04-27
Abstract
No abstract record available.
Inventors
- 👤 Walter H Schuller
- 👤 David C Guth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 00:57
CPC Classifications
C; C08; C08L; C08L39/00; C08L39/04; C08F; C08F8/00; C08F8/44; C08F2800/00; C08F2800/20; C08F2810/00; C08F2810/50
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
60 words
THE METHOD WHICH COMPRISES BRINGING INTO REACTIVE CONTACT WITH EACH OTHER, AT A PH OF NOT LESS THAN ABOUT 7.0 AND AT A TEMPERATURE OF FROM ABOUT 10*C. TO ABOUT 100*C., (1) A POLYMER CONTAINING A PLURALITY OF TERTIARY AMINE GROUPS, SAID POLYMER BEING SELECTED FROM THE CLASS CONSISTING OF (A) HOMOPOLYMERS OF A VINYL-PYRIDINE REPRESENTED BY THE GENERAL FORMULA
Claim 2
Independent Claim
60 words
THE METHOD WHICH COMPRISES BRINGING INTO REACTIVE CONTACT WITH EACH OTHER, AT A PH OF NOT LESS THAN ABOUT 7.0 AND AT A TEMPERATURE OF FROM ABOUT 10*C. TO ABOUT 100*C., (1) A POLYMER CONTAINING A PLURALITY OF TERTIARY AMINE GROUPS, SAID POLYMER BEING SELECTED FROM THE CLASS CONSISTING OF (A) HOMOPOLYMERS OF A VINYL-PYRIDINE REPRESENTED BY THE GENERAL FORMULA
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-11-01 | 1964-05-02 | 1964-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-11-01 | 1968-05-02 | 1968-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-11-01 | 1972-05-02 | 1972-11-01 | $7700.00 | Window Closed / Lapsed |