US3284419A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Poly
Assignee: Shell USA Inc
•
Filing: 1961-03-23
•
Granted: 1966-11-08
•
Expires: 1981-03-23
Abstract
No abstract record available.
Inventors
- 👤 Friedrich G Helfferich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:28
CPC Classifications
B; B01; B01J; B01J39/00; B01J39/08; B01J39/16; B01J39/18; B01J39/20; C; C08; C08F; C08F8/00; C08F8/06; C08F2800/00; C08F2800/10; C08F2810/00; C08F2810/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
107 words
A WATER-INSOLUBLE, CROSS-LINKED RESIN HAVING A HYDROGEN PEROXIDE-RESISTANT MATRIX TO WHICH IS ATTACHED STRONGLY DISSOCIATED, HYDROPHILIC ACID GROUPS AND CARBOXYLIC ACID GROUPS, THE SAID STRONGLY DISSOCIATED, HYDROPHILIC ACID GROUPS BEING IN SUFFICIENT PROMIMITY TO THE CARBOXYLIC ACID GROUPS TO CAUSE THE RESIN TO SWELL IN THE VICINITY OF THESE CARBOXYLIC ACID GROUPS WHEN IN AQUEOUS HYDROGEN PEROXIDE ACID GROUPS, THE SAID STRONGLY DISSOCIATED TO SAID CARBOXYLIC ACID GROUPS, THE SAID STRONGLY DISSOCIATED HYDROPHILIC ACID GROUPS AND CARBOXYLIC ACID GROUPS BEING IN A MOLE RAITO OF AT LEAST 0.1:1 BUT NOT GRATER THAN 4:1, AND AT LEAST 20% OF SAID CARBOXYLIC ACID GROUPS BEING PERCARBOXYLIC ACID GROUPS (-COOOH).
Claim 2
Dependent Claim
107 words
A WATER-INSOLUBLE, CROSS-LINKED RESIN HAVING A HYDROGEN PEROXIDE-RESISTANT MATRIX TO WHICH IS ATTACHED STRONGLY DISSOCIATED, HYDROPHILIC ACID GROUPS AND CARBOXYLIC ACID GROUPS, THE SAID STRONGLY DISSOCIATED, HYDROPHILIC ACID GROUPS BEING IN SUFFICIENT PROMIMITY TO THE CARBOXYLIC ACID GROUPS TO CAUSE THE RESIN TO SWELL IN THE VICINITY OF THESE CARBOXYLIC ACID GROUPS WHEN IN AQUEOUS HYDROGEN PEROXIDE ACID GROUPS, THE SAID STRONGLY DISSOCIATED TO SAID CARBOXYLIC ACID GROUPS, THE SAID STRONGLY DISSOCIATED HYDROPHILIC ACID GROUPS AND CARBOXYLIC ACID GROUPS BEING IN A MOLE RAITO OF AT LEAST 0.1:1 BUT NOT GRATER THAN 4:1, AND AT LEAST 20% OF SAID CARBOXYLIC ACID GROUPS BEING PERCARBOXYLIC ACID GROUPS (-COOOH).
References Cited (Backward Citations)
US2678307A
Cited
US3133030A
Cited
US2911391A
Cited
US2910504A
Cited
US2814641A
Cited
US2877266A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-11-07 | 1970-05-09 | 1970-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-07 | 1974-05-09 | 1974-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-07 | 1978-05-09 | 1978-11-08 | $7700.00 | Window Closed / Lapsed |