US2640820A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of water-soluble resin
Assignee: —
•
Filing: —
•
Granted: 1953-06-02
•
Expires: 1970-06-02
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:13
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/34; C08F8/36; C08L; C08L25/00; C08L25/02; C08L25/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
41 words
A METHOD FOR MAKING A WATER-SOLUBLE SULPHONATE OF AN ALKENYL AROMATIC RESIN, SAID RESIN BEING A BENZENE-SOLUBLE POLYMER CONTAINING IN CHEMICALLY COMBINED FORM AT LEAST 50 PER CENT BY WEIGHT OF AT LEAST ONE ALKENYL AROMATIC COMPOUND HAVING THE GENERAL FORMULA:
Claim 2
Independent Claim
41 words
A METHOD FOR MAKING A WATER-SOLUBLE SULPHONATE OF AN ALKENYL AROMATIC RESIN, SAID RESIN BEING A BENZENE-SOLUBLE POLYMER CONTAINING IN CHEMICALLY COMBINED FORM AT LEAST 50 PER CENT BY WEIGHT OF AT LEAST ONE ALKENYL AROMATIC COMPOUND HAVING THE GENERAL FORMULA:
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-01 | 1956-12-01 | 1957-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-01 | 1960-12-01 | 1961-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-01 | 1964-12-01 | 1965-06-02 | $7700.00 | Window Closed / Lapsed |