Patent US3028369A successfully refreshed from Google Patents.
US3028369A
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Isocyanate catalyzed polymerization of lactams
Assignee: Monsanto Chemicals Ltd
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Filing: 1958-07-21
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Granted: 1962-04-03
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Expires: 1978-07-21
Abstract
No abstract record available.
Inventors
- 👤 John M Butler
- 👤 Ross M Hedrick
- 👤 Edward H Mottus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:59
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/08; C08G69/14; C08G69/16; C08G69/18; C08G69/20; Y; Y10; Y10S; Y10S264/00; Y10S264/56
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
88 words
IN THE CATALYZED POLYMERIZATION OF LACTAMS OF A MONOAMINOMONOCARBOXYLIC ACID, WHEREIN SAID LACTAMS ARE CHARACTERIZED BY THE PRESENCE OF A SINGLE AMIDE GROUP IN THE LACTAM RING, WITH A MEMBER SELECTED FROM THE GROUP CONSISTING OF ALKALI AND ALKALINE EARTH METAL CATALYSTS, THE IMPROVEMENT WHICH COMPRISES CARRYING OUT SAID CATALYZED POLYMERIZATION UNDER SUBSTANTIALLY ANHYDROUS CONDITIONS IN THE ADDITIONAL PRESENCE OF FROM ABOUT 0.1 TO ABOUT 5 MOLE PERCENT, BASED UPON THE LACTAM BEING POLYMERIZED, OF AN ORGANIC ISOCYANATE, FREE FROM OTHER SUBSTITUENTS WHICH WILL REACT WITH THE LACTAM.
Claim 2
Dependent Claim
88 words
IN THE CATALYZED POLYMERIZATION OF LACTAMS OF A MONOAMINOMONOCARBOXYLIC ACID, WHEREIN SAID LACTAMS ARE CHARACTERIZED BY THE PRESENCE OF A SINGLE AMIDE GROUP IN THE LACTAM RING, WITH A MEMBER SELECTED FROM THE GROUP CONSISTING OF ALKALI AND ALKALINE EARTH METAL CATALYSTS, THE IMPROVEMENT WHICH COMPRISES CARRYING OUT SAID CATALYZED POLYMERIZATION UNDER SUBSTANTIALLY ANHYDROUS CONDITIONS IN THE ADDITIONAL PRESENCE OF FROM ABOUT 0.1 TO ABOUT 5 MOLE PERCENT, BASED UPON THE LACTAM BEING POLYMERIZED, OF AN ORGANIC ISOCYANATE, FREE FROM OTHER SUBSTITUENTS WHICH WILL REACT WITH THE LACTAM.
References Cited (Backward Citations)
US2241321A
Cited
US2638463A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-04-02 | 1965-10-02 | 1966-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-04-02 | 1969-10-02 | 1970-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-04-02 | 1973-10-02 | 1974-04-03 | $7700.00 | Window Closed / Lapsed |