Patent US2948710A successfully refreshed from Google Patents.
US2948710A
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Suspension polymerization in the presence of tricalcium phosphate and sodium betanaphthalene sulfonate
Assignee: Foster Grant Co Inc
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Filing: 1957-07-29
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Granted: 1960-08-09
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Expires: 1977-07-29
Abstract
No abstract record available.
Inventors
- 👤 Alelio Gaetano F D
- 👤 Silberberg Melvin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:35
CPC Classifications
C; C08; C08F; C08F2/00; C08F2/12; C08F2/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
58 words
IN A PROCESS FOR PREPARING POLYMER BEADS, THE STEP OF POLYMERIZING IN A STABLE AQUEOUS SUSPENSION A POLYMERIZABLE COMPOSITION COMPRISING AT LEAST ONE SUSPENSION-POLYMERIZABLE VINYL AROMATIC MONOMER, SAID SUSPENSION COMPRISING FINELY DIVIDED TRICALCIUM PHOSPHATE AS THE STABILIZING AGENT AND CONSISTING AN AMOUNT OF SODIUM BETANAPHTHALENE SULFONATE IN THE RANGE OF 0.1 TO 2.00% BY WEIGHT OF TOTAL SUSPENSION.
Claim 2
Dependent Claim
58 words
IN A PROCESS FOR PREPARING POLYMER BEADS, THE STEP OF POLYMERIZING IN A STABLE AQUEOUS SUSPENSION A POLYMERIZABLE COMPOSITION COMPRISING AT LEAST ONE SUSPENSION-POLYMERIZABLE VINYL AROMATIC MONOMER, SAID SUSPENSION COMPRISING FINELY DIVIDED TRICALCIUM PHOSPHATE AS THE STABILIZING AGENT AND CONSISTING AN AMOUNT OF SODIUM BETANAPHTHALENE SULFONATE IN THE RANGE OF 0.1 TO 2.00% BY WEIGHT OF TOTAL SUSPENSION.
References Cited (Backward Citations)
US2652392A
Cited
US2673194A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-08-09 | 1964-02-08 | 1964-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-08-09 | 1968-02-08 | 1968-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-08-09 | 1972-02-08 | 1972-08-09 | $7700.00 | Window Closed / Lapsed |