US3058968A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerization of mono- and polymethylstyrene
Assignee: Dow Chemical Co
•
Filing: 1959-12-21
•
Granted: 1962-10-16
•
Expires: 1979-12-21
Abstract
No abstract record available.
Inventors
- 👤 Frederick J Soderquist
- 👤 Harold D Boyce
- 👤 James L Amos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:21
CPC Classifications
C; C08; C08F; C08F12/00; C08F12/02; C08F12/04; C08F12/06; C08F12/12; C08F212/00; C08F212/02; C08F212/04; C08F212/06; C08F212/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
144 words
A PROCESS FOR POLYMERIZING AR-MONO- AND POLYMETHYLSTYRENE WHICH COMPRISES CHARGING SAID METHYL STYRENES INTO A ROTATING BALL MILL WHICH IS MAINTAINED AT A POLYMERIZING TEMPERATURE, AND WHICH CONTAINS FROM ABOUT 4 TO ABOUT 12 VOLUME PERCENT, AND NOT LESS THAN 3 CONTINUOUS ROWS, OF SPHEROIDS OF AT LEAST TWO DIFFERENT WEIGHTS, WITH THE BALLS OF GREATER MASS FORMING AT LEAST ONE ROW AND THE NUMBER OF BALLS OF SMALLER MASS BEING NOT LESS THAN 1/3 THE NUMBER OF BALLS OF GREATER MASS, AND ROTATING SAID BALL MILL AT A PERIPHERAL SPEED OF 50 TO 100 FEET PER MINUTE THUS CARRYING THE BALLS OF SMALLER MASS UP THE WALL OF THE BALL MILL TO A POSITION FROM WHICH THEY FALL BACK INTO THE POLYMERIZING MIX-TURE AND DISPLACE THE BALLS OF GREATER MASS TO A NEW POSITION IN THE CONTINUOUS ROW OF BALLS, THEREBY PREVENTING TRACKING.
Claim 2
Dependent Claim
144 words
A PROCESS FOR POLYMERIZING AR-MONO- AND POLYMETHYLSTYRENE WHICH COMPRISES CHARGING SAID METHYL STYRENES INTO A ROTATING BALL MILL WHICH IS MAINTAINED AT A POLYMERIZING TEMPERATURE, AND WHICH CONTAINS FROM ABOUT 4 TO ABOUT 12 VOLUME PERCENT, AND NOT LESS THAN 3 CONTINUOUS ROWS, OF SPHEROIDS OF AT LEAST TWO DIFFERENT WEIGHTS, WITH THE BALLS OF GREATER MASS FORMING AT LEAST ONE ROW AND THE NUMBER OF BALLS OF SMALLER MASS BEING NOT LESS THAN 1/3 THE NUMBER OF BALLS OF GREATER MASS, AND ROTATING SAID BALL MILL AT A PERIPHERAL SPEED OF 50 TO 100 FEET PER MINUTE THUS CARRYING THE BALLS OF SMALLER MASS UP THE WALL OF THE BALL MILL TO A POSITION FROM WHICH THEY FALL BACK INTO THE POLYMERIZING MIX-TURE AND DISPLACE THE BALLS OF GREATER MASS TO A NEW POSITION IN THE CONTINUOUS ROW OF BALLS, THEREBY PREVENTING TRACKING.
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) | 1965-10-15 | 1966-04-16 | 1966-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-10-15 | 1970-04-16 | 1970-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-10-15 | 1974-04-16 | 1974-10-16 | $7700.00 | Window Closed / Lapsed |