Patent US2964240A successfully refreshed from Google Patents.
Patent US2861101A successfully refreshed from Google Patents.
US2861101A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Linear polysulfonic acid polymers
Assignee: Dow Chemical Co
•
Filing: 1956-04-13
•
Granted: 1958-11-18
•
Expires: 1976-04-13
Abstract
No abstract record available.
Inventors
- 👤 William F Tousignant
- 👤 Jr Thomas Houtman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:52
CPC Classifications
C; C08; C08G; C08G65/00; C08G65/02; C08G65/32; C08G65/321; C08G65/326; C07; C07C; C07C309/00; C07C309/01; C07C309/02; C07C309/03; C07C309/07; C07C309/09; C07C309/10; Y; Y10; Y10S; Y10S516/00; Y10S516/01; Y10S516/03
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
7 words
A POLYMERIC MATERIAL HAVING THE GENERAL FORMULA:
Claim 2
Dependent Claim
7 words
A POLYMERIC MATERIAL HAVING THE GENERAL FORMULA:
Claim 3
Dependent Claim
14 words
METHOD FOR THE PREPARATION OF A POLYSULFONIC ACID POLYMERIC MATERIAL HAVING THE GENERAL FORMULA:
Claim 4
Dependent Claim
14 words
METHOD FOR THE PREPARATION OF A POLYSULFONIC ACID POLYMERIC MATERIAL HAVING THE GENERAL FORMULA:
References Cited (Backward Citations)
FR857893A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-11-17 | 1962-05-19 | 1962-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-11-17 | 1966-05-19 | 1966-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-11-17 | 1970-05-19 | 1970-11-18 | $7700.00 | Window Closed / Lapsed |