US3050505A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copolymerization process
Assignee: White Laboratories Inc
•
Filing: 1960-09-06
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Granted: 1962-08-21
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Expires: 1980-09-06
Abstract
No abstract record available.
Inventors
- 👤 Frank R A Litterio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:26
CPC Classifications
C; C08; C08F; C08F2/00; C08F2/12; C08F2/16; C08F4/00; C08F4/06; Y; Y10; Y10S; Y10S526/00; Y10S526/93
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
107 words
THE PROCESS OF PREPARING CROSS-LINKED WATER SWELLABLE RESINS IN THE FORM OF DISTINCT, RELATIVELY UNIFORMLY SIZED, SMALL BEADS WHICH COMPRISES: INTRODUCING AN ETHYLENICALLY UNSATURATED MONOMER SUBJECT TO BOTH HOMOAND COPOLYMERIZATION, A COPOLYMERIZABLE DIETHYLENICALLY UNSATURATED CROSS-LINKING AGENT, AND A CPOLYMERIZATION INITIATOR INTO A VIGOROUSLY AGITATED, SMOOTH AQUEOUS SLURRY OF A WATER-SOLUBLE INORGANIC NON-REDOX DIVALENT-ION CONTAINING SALT MAINTAINED AT ABOUT 75-78 DEGREES CENTIGRADE; HEATING THE RESULTANT ADMIXTURE FOR ABOUT 15 MINUTES WITH AGITATION AT ABOUT 74-75 DEGREES CENTIGRADE, AND THEN HEATING THE ADMIXTURE AT ABOUT 90-95 DEGREES CENTIGRADE WITH AGITATION UNTIL THE RESIN HAS BEEN FORMED AS BEADS; DISCONTINUING HEATING AND AGITATION; WASHING THE RESIN BEADS, AND DRYING THEM.
Claim 2
Dependent Claim
107 words
THE PROCESS OF PREPARING CROSS-LINKED WATER SWELLABLE RESINS IN THE FORM OF DISTINCT, RELATIVELY UNIFORMLY SIZED, SMALL BEADS WHICH COMPRISES: INTRODUCING AN ETHYLENICALLY UNSATURATED MONOMER SUBJECT TO BOTH HOMOAND COPOLYMERIZATION, A COPOLYMERIZABLE DIETHYLENICALLY UNSATURATED CROSS-LINKING AGENT, AND A CPOLYMERIZATION INITIATOR INTO A VIGOROUSLY AGITATED, SMOOTH AQUEOUS SLURRY OF A WATER-SOLUBLE INORGANIC NON-REDOX DIVALENT-ION CONTAINING SALT MAINTAINED AT ABOUT 75-78 DEGREES CENTIGRADE; HEATING THE RESULTANT ADMIXTURE FOR ABOUT 15 MINUTES WITH AGITATION AT ABOUT 74-75 DEGREES CENTIGRADE, AND THEN HEATING THE ADMIXTURE AT ABOUT 90-95 DEGREES CENTIGRADE WITH AGITATION UNTIL THE RESIN HAS BEEN FORMED AS BEADS; DISCONTINUING HEATING AND AGITATION; WASHING THE RESIN BEADS, AND DRYING THEM.
References Cited (Backward Citations)
US2440808A
Cited
US2810716A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-08-20 | 1966-02-19 | 1966-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-08-20 | 1970-02-19 | 1970-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-08-20 | 1974-02-19 | 1974-08-21 | $7700.00 | Window Closed / Lapsed |