US2691008A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extraction process for polymer particles
Assignee: Beazer East Inc
•
Filing: 1950-02-21
•
Granted: 1954-10-05
•
Expires: 1970-02-21
Abstract
No abstract record available.
Inventors
- 👤 Grim John Marshall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:18
CPC Classifications
C; C08; C08F; C08F6/00; C08F6/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
104 words
IN A PROCESS FOR TREATING POLYMERIC VINYL ARYL COMPOUND PARTICLS TO SEPARATE LOW-MOLECULARWEIGHT COMPONENTS THEREFROM, THE STEPS WHICH COMPRISE FORMING A SUSPENSION OF THE POLYMER PARTICLES AND A SUSPENSION STABILIZER CHOSEN FROM THE CLASS CONSISTING OF TRICALCIUM PHOSPHATE, MAGNESIUM PHOSPHATE, BARIUM PHOSPHATE, ALUMINUM PHOSPHATE, CALCIUM FLUORIDE, TALC, KAOLIN, KIESELGUHR, ALUMINUM OXIDE, BARIUM SULFATE, ZINC OXIDE, MAGNESIUM CARBONATE, AND FERRIC CARBONATE IN A LIQUID MEDIUM CONSISTING ESSENTIALLY OF AN ALCOHOL CONTAINING LESS THAN FOUR CARBON ATOMS MAINTAINING SAID POLYMER PARTICLES IN CONTACT WITH SAID LIQUID MEDIUM WHEREBY LOW-MOLECULAR-WEIGHT COMPONENTS ARE EXTRACTED BY SAID LIQUID MEDIUM AND SEPARATING THE PURIFIED POLYMER PARTICLES FROM SAID LIQUID MEDIUM.
Claim 2
Dependent Claim
104 words
IN A PROCESS FOR TREATING POLYMERIC VINYL ARYL COMPOUND PARTICLS TO SEPARATE LOW-MOLECULARWEIGHT COMPONENTS THEREFROM, THE STEPS WHICH COMPRISE FORMING A SUSPENSION OF THE POLYMER PARTICLES AND A SUSPENSION STABILIZER CHOSEN FROM THE CLASS CONSISTING OF TRICALCIUM PHOSPHATE, MAGNESIUM PHOSPHATE, BARIUM PHOSPHATE, ALUMINUM PHOSPHATE, CALCIUM FLUORIDE, TALC, KAOLIN, KIESELGUHR, ALUMINUM OXIDE, BARIUM SULFATE, ZINC OXIDE, MAGNESIUM CARBONATE, AND FERRIC CARBONATE IN A LIQUID MEDIUM CONSISTING ESSENTIALLY OF AN ALCOHOL CONTAINING LESS THAN FOUR CARBON ATOMS MAINTAINING SAID POLYMER PARTICLES IN CONTACT WITH SAID LIQUID MEDIUM WHEREBY LOW-MOLECULAR-WEIGHT COMPONENTS ARE EXTRACTED BY SAID LIQUID MEDIUM AND SEPARATING THE PURIFIED POLYMER PARTICLES FROM SAID LIQUID MEDIUM.
References Cited (Backward Citations)
US2331273A
Cited
US2408007A
Cited
US2456265A
Cited
US2403966A
Cited
US2523289A
Cited
US2514191A
Cited
US2507153A
Cited
US2538273A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-10-04 | 1958-04-05 | 1958-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-10-04 | 1962-04-05 | 1962-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-10-04 | 1966-04-05 | 1966-10-05 | $7700.00 | Window Closed / Lapsed |