US3222343A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing flat particles of polymers of vinyl aromatic monomers
Assignee: Atlantic Richfield Co
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Filing: 1961-12-12
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Granted: 1965-12-07
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Expires: 1981-12-12
Abstract
No abstract record available.
Inventors
- 👤 Alvin R Ingram
- 👤 Jurgeleit Hans Wolfgang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:56
CPC Classifications
C; C08; C08F; C08F12/00; C08F12/02; C08F12/04; C08F12/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
75 words
A METHOD FOR THE PRODUCTION OF NON-SPHERICAL POLYMER PARTICLES WHICH COMPRISES: (A) SUSPENDING ONE PART BY WEIGHT OF A VINYL AROMATIC MONOMER AND A POLYMERIZATION INITIATOR IN AN AQUEOUS MEDIUM WITH FROM 0.00075 TO 0.0022 PART OF A SYNERGISTIC AGENT COMPRISING HYDROXYETHYL CELLULOSE AND AN ALKALI METAL PHOSPHATE, THE RATIO OF SAID HYDROXYETHYL CELLULOSE TO SAID ALKALI METAL PHOSPHATE BEING BETWEEN 1:0.2 AND 1:2.0, SAID ALKALI METAL PHOSPHATE COMPRISING A SODIUM SALT OF THE ACID
Claim 2
Independent Claim
75 words
A METHOD FOR THE PRODUCTION OF NON-SPHERICAL POLYMER PARTICLES WHICH COMPRISES: (A) SUSPENDING ONE PART BY WEIGHT OF A VINYL AROMATIC MONOMER AND A POLYMERIZATION INITIATOR IN AN AQUEOUS MEDIUM WITH FROM 0.00075 TO 0.0022 PART OF A SYNERGISTIC AGENT COMPRISING HYDROXYETHYL CELLULOSE AND AN ALKALI METAL PHOSPHATE, THE RATIO OF SAID HYDROXYETHYL CELLULOSE TO SAID ALKALI METAL PHOSPHATE BEING BETWEEN 1:0.2 AND 1:2.0, SAID ALKALI METAL PHOSPHATE COMPRISING A SODIUM SALT OF THE ACID
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-12-06 | 1969-06-07 | 1969-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-06 | 1973-06-07 | 1973-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-06 | 1977-06-07 | 1977-12-07 | $7700.00 | Window Closed / Lapsed |