US3300422A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of expanded polyamides
Assignee: BASF SE
•
Filing: 1963-09-12
•
Granted: 1967-01-24
•
Expires: 1983-09-12
Abstract
No abstract record available.
Inventors
- 👤 Bayerlein Friedrich
- 👤 Wilhelm Hans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:15
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08G; C08G69/00; C08G69/02; C08G69/08; C08G69/14; C08G69/16; C08G69/18; C08J9/0066; C08J2377/00; Y; Y10; Y10S; Y10S264/00; Y10S264/05
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
85 words
IN A PROCESS FOR PRODUCTION OF EXPANDED POLYAMIDES BY THE ACTIVATED ANIONIC POLYMERIZATION OF ONE OR MORE LACTAMS WITH 7-14 RING MEMBERS AT TEMPERATURE BETWEEN THE MELTING POINT OF SAID LACTAM AND 200*C. WITH AN ALKALINE CATALYST, A POLYMERIZATION ACTIVATOR AND A BLOWING AGENT DECOMPOSABLE OR VOLATILIZABLE AT SAID TEMPERATURES WITH FOAMING OF THE POLYMERIZATION MASS BY SAID BLOWING AGENT AS THE POLYMERIZATION REACTION PROCEEDS, THE IMPROVEMENT WHICH COMPRISES DISTRIBUTING IN SAID LACTAM 0.05-5% BY WEIGHT, WITH REFERENCE TO SAID LACTAM, OR CALCIUM SULFATE HEMIHYDRATE.
Claim 2
Dependent Claim
85 words
IN A PROCESS FOR PRODUCTION OF EXPANDED POLYAMIDES BY THE ACTIVATED ANIONIC POLYMERIZATION OF ONE OR MORE LACTAMS WITH 7-14 RING MEMBERS AT TEMPERATURE BETWEEN THE MELTING POINT OF SAID LACTAM AND 200*C. WITH AN ALKALINE CATALYST, A POLYMERIZATION ACTIVATOR AND A BLOWING AGENT DECOMPOSABLE OR VOLATILIZABLE AT SAID TEMPERATURES WITH FOAMING OF THE POLYMERIZATION MASS BY SAID BLOWING AGENT AS THE POLYMERIZATION REACTION PROCEEDS, THE IMPROVEMENT WHICH COMPRISES DISTRIBUTING IN SAID LACTAM 0.05-5% BY WEIGHT, WITH REFERENCE TO SAID LACTAM, OR CALCIUM SULFATE HEMIHYDRATE.
References Cited (Backward Citations)
US1880601A
Cited
US2205722A
Cited
US2311233A
Cited
US2594280A
Cited
US2664406A
Cited
US2846332A
Cited
US3017391A
Cited
US3062682A
Cited
US3061592A
Cited
US3166533A
Cited
US3207729A
Cited
US3214415A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-01-23 | 1970-07-25 | 1971-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-23 | 1974-07-25 | 1975-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-23 | 1978-07-25 | 1979-01-24 | $7700.00 | Window Closed / Lapsed |