Patent US3251799A successfully refreshed from Google Patents.
US3251799A
Expired / Lapsed
US
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Lactam polymerization, heterocyclic promoters therefor, and products thereof
Assignee: Honeywell International Inc
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Filing: 1962-09-11
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Granted: 1966-05-17
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Expires: 1982-09-11
Abstract
No abstract record available.
Inventors
- 👤 Edward W Pietrusza
- 👤 Pinter Rudolph
- 👤 Jack R Pedersen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 03:55
CPC Classifications
C; C07; C07D; C07D403/00; C07D403/02; C07D403/04; C07D201/00; C07D201/14; C07D413/00; C07D413/02; C07D413/04; C07D417/00; C07D417/02; C07D417/04; C08; C08G; C08G69/00; C08G69/02; C08G69/08; C08G69/14; C08G69/16; C08G69/18; C08G69/20; C08J; C08J9/00; C08J9/04; C08J9/06; C08J9/10; C08J2377/00; C08J2377/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
114 words
IN A PROCESS FOR THE POLYMERIZATION OF A LACTAM HAVING A SATURATED RING, SAID RING CONSISTING OF AT LEAST ONE IMIDE GROUP AND AT LEAST 5 ADDITIONAL ATOMS, ALL OF WHICH RING ATOMS OTHER THAN THOSE OF THE IMIDE GROUPS ARE CARBON ATOMS, SAID POLYMRIZATION BEING CATALYZED BY A METAL CATALYST SUITABLE FOR ANIONIC POLYMERIZATION, BEING AT TEMPERATURE IN THE RANGE FROM ABOUT 100*C. TO ABOUT 250*C., AND BEING IN A REACTION SYSTEM PROTECTED FROM SUBSTANCES REACTIVE WITH METAL SALTS OF IMIDES: THE IMPROVEMENT WHICH COMPRISES EMPLOYING IN THE REACTION MIXTURE, AS PROMOTER, A LACTAM AS ABOVE DEFINED AND BEARING ON ITS IMIDO GROUP A SUBSTITUENT OF THE GROUP CONSISTING OF 2-OXAZOLYLS AND 2-THIAZOLYLS.
Claim 2
Dependent Claim
114 words
IN A PROCESS FOR THE POLYMERIZATION OF A LACTAM HAVING A SATURATED RING, SAID RING CONSISTING OF AT LEAST ONE IMIDE GROUP AND AT LEAST 5 ADDITIONAL ATOMS, ALL OF WHICH RING ATOMS OTHER THAN THOSE OF THE IMIDE GROUPS ARE CARBON ATOMS, SAID POLYMRIZATION BEING CATALYZED BY A METAL CATALYST SUITABLE FOR ANIONIC POLYMERIZATION, BEING AT TEMPERATURE IN THE RANGE FROM ABOUT 100*C. TO ABOUT 250*C., AND BEING IN A REACTION SYSTEM PROTECTED FROM SUBSTANCES REACTIVE WITH METAL SALTS OF IMIDES: THE IMPROVEMENT WHICH COMPRISES EMPLOYING IN THE REACTION MIXTURE, AS PROMOTER, A LACTAM AS ABOVE DEFINED AND BEARING ON ITS IMIDO GROUP A SUBSTITUENT OF THE GROUP CONSISTING OF 2-OXAZOLYLS AND 2-THIAZOLYLS.
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) | 1969-05-16 | 1969-11-15 | 1970-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-16 | 1973-11-15 | 1974-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-16 | 1977-11-15 | 1978-05-17 | $7700.00 | Window Closed / Lapsed |