US3298977A
Expired / Lapsed
US
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Suspension polymerization of lactams using polymeric materials as suspension agents
Assignee: Bridgestone Firestone Inc
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Filing: 1962-05-07
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Granted: 1967-01-17
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Expires: 1982-05-07
Abstract
No abstract record available.
Inventors
- 👤 James J Robertson
- 👤 Robert A Hayes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:45
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/26; C08G69/28; C08G69/30; C08F; C08F2/00; C08F2/04; C08F2/06; C08F2/08; C08F2/36; C08F291/00; C08F291/02; C08F297/00; C08F297/02; C08F297/04; C08F36/00; C08F36/02; C08F36/04; C08G63/00; C08G63/02; C08G63/06; C08G63/08; C08G65/00; C08G65/02; C08G65/04; C08G65/06; C08G65/08; C08G69/08; C08G69/14; C08G69/16; C08G69/18; C08G69/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
93 words
THE METHOD OF POLYMERIZING LACTAMS CONTAINING 4 TO 10 CARBON ATOMS IN THE RING, BY POLYMERIZATION IN AN ORGANIC SOLVENT, WHICH METHOD COMPRISES TREATING SAID LACTAM IN THE PRESENCE OF A POLYMERIC SUSPENDING INGREDIENT WITH A MOLECULAR WEIGHT OF AT LEAST SUBSTANTIALLY 1500 WHICH IS DISSOLVED IN THE SOLVENT AT THE TEMPERATURE AT WHICH POLYMERIZATION OF SAID MONOMER OCCURS, ALLOWING SUBSTANTIAL POLYMERIZATION TO OCCUR WITH PRODUCTION OF BEADS EACH MEASURING WITHIN THE RANGE OF SUBSTANTIALLY 10 MICRONS TO 5 MILLIMETERS IN SIZE, THE POLYMERIC PRODUCT BEING INSOLUBLE IN THE SOLVENT AT THAT TEMPERATURE.
Claim 2
Independent Claim
93 words
THE METHOD OF POLYMERIZING LACTAMS CONTAINING 4 TO 10 CARBON ATOMS IN THE RING, BY POLYMERIZATION IN AN ORGANIC SOLVENT, WHICH METHOD COMPRISES TREATING SAID LACTAM IN THE PRESENCE OF A POLYMERIC SUSPENDING INGREDIENT WITH A MOLECULAR WEIGHT OF AT LEAST SUBSTANTIALLY 1500 WHICH IS DISSOLVED IN THE SOLVENT AT THE TEMPERATURE AT WHICH POLYMERIZATION OF SAID MONOMER OCCURS, ALLOWING SUBSTANTIAL POLYMERIZATION TO OCCUR WITH PRODUCTION OF BEADS EACH MEASURING WITHIN THE RANGE OF SUBSTANTIALLY 10 MICRONS TO 5 MILLIMETERS IN SIZE, THE POLYMERIC PRODUCT BEING INSOLUBLE IN THE SOLVENT AT THAT TEMPERATURE.
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) | 1970-01-16 | 1970-07-18 | 1971-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-16 | 1974-07-18 | 1975-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-16 | 1978-07-18 | 1979-01-17 | $7700.00 | Window Closed / Lapsed |