US3370022A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Expandable polymers
Assignee: Atlantic Richfield Co
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Filing: 1965-12-03
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Granted: 1968-02-20
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Expires: 1985-12-03
Abstract
No abstract record available.
Inventors
- 👤 Alvin R Ingram
- 👤 Alvin J Zupanc
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:31
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/16; C08J9/20; C08F; C08F12/00; C08F12/02; C08F12/04; C08F12/06; C08F12/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
109 words
A METHOD OF PREPARING EXPANDABLE THRMOPLASTIC POLYMER PARTICLES WICH WILL NOT LUMP UPON PRE-EXPANSION COMPRISING POLYMERIZING A VINYL AROMATIC MONOMER, EITHER ALONE OR IN ADMIXTURE WITH OTHER POLYMERIZABLE MONOMERS COPOLYMERIZABLE THEREWITH, IN AN AQUEOUS SUSPENSION IN THE PRESENCE OF A CATALYTIC AMOUNT OF A FREE RADICAL INITIATOR AND A SUSPENDING AGENT UNTIL BETWEEN ABOUT 50 AND 95 PERCENT CONVERSION OF THE VINYL MONOMER TO POLYMR HAS OCCURED, THEN ADDING AT LEAST ABOUT 0.05 PERCENT BY WEIGHT OF AN UNSATURATED POLYESTER RESIN BASED ON THE WEIGHT OF SAID MONOMER, COMPLETING SAID POLYMERIZATIION, AND RENDERING THE POLYMER PARTICLES EXPANDABLE BY INCORPORATING THEREIN FROM 3-20 PERCENT BY WEIGHT OF A BLOWING AGENT.
Claim 2
Independent Claim
109 words
A METHOD OF PREPARING EXPANDABLE THRMOPLASTIC POLYMER PARTICLES WICH WILL NOT LUMP UPON PRE-EXPANSION COMPRISING POLYMERIZING A VINYL AROMATIC MONOMER, EITHER ALONE OR IN ADMIXTURE WITH OTHER POLYMERIZABLE MONOMERS COPOLYMERIZABLE THEREWITH, IN AN AQUEOUS SUSPENSION IN THE PRESENCE OF A CATALYTIC AMOUNT OF A FREE RADICAL INITIATOR AND A SUSPENDING AGENT UNTIL BETWEEN ABOUT 50 AND 95 PERCENT CONVERSION OF THE VINYL MONOMER TO POLYMR HAS OCCURED, THEN ADDING AT LEAST ABOUT 0.05 PERCENT BY WEIGHT OF AN UNSATURATED POLYESTER RESIN BASED ON THE WEIGHT OF SAID MONOMER, COMPLETING SAID POLYMERIZATIION, AND RENDERING THE POLYMER PARTICLES EXPANDABLE BY INCORPORATING THEREIN FROM 3-20 PERCENT BY WEIGHT OF A BLOWING AGENT.
References Cited (Backward Citations)
US2865800A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-02-19 | 1971-08-21 | 1972-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-02-19 | 1975-08-21 | 1976-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-02-19 | 1979-08-21 | 1980-02-20 | $7700.00 | Window Closed / Lapsed |