Patent US3359104A successfully refreshed from Google Patents.
Patent US3207729A successfully refreshed from Google Patents.
US3207729A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anionic polymerization of lactams with 2, 2, 4, 4-tetramethyl-1, 3-cyclobutane dione as promoter
Assignee: EIDP Inc
•
Filing: 1962-10-08
•
Granted: 1965-09-21
•
Expires: 1982-10-08
Abstract
No abstract record available.
Inventors
- 👤 John W Giberson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:13
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/08; C08G69/14; C08G69/16; C08G69/18; C08G69/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
79 words
IN A PROCESS FOR THE POLYMERIZATION OF SUBSTANTIALLY ANHYDROUS LACTAMS HAVING FROM 3 TO 1I CARBON ATOMS IN THE RING WHICH COMPRISES HEATING SAID LACTAM TO A TEMPERATURE BELOW THE MELTING POINT OF THE RESULTING POLYAMIDE IN THE PRESENCE OF A LACTAM-BASE SALT MADE FROM ABOUT 0.1 TO ABOUT 10 MOLE PERCENT BASE, BASED ON LACTAM, AND A COCATALYST, THE IMPROVEMENT WHICH COMPRISES USING AS A COCATALYST FROM ABOUT 0.05 TO 5 MOLE PERCENT, BASED ON LACTAM, OF 2,2,4,4-TETRAMETHYL-1,3-CYCLOBUTANEDIONE.
Claim 2
Dependent Claim
79 words
IN A PROCESS FOR THE POLYMERIZATION OF SUBSTANTIALLY ANHYDROUS LACTAMS HAVING FROM 3 TO 1I CARBON ATOMS IN THE RING WHICH COMPRISES HEATING SAID LACTAM TO A TEMPERATURE BELOW THE MELTING POINT OF THE RESULTING POLYAMIDE IN THE PRESENCE OF A LACTAM-BASE SALT MADE FROM ABOUT 0.1 TO ABOUT 10 MOLE PERCENT BASE, BASED ON LACTAM, AND A COCATALYST, THE IMPROVEMENT WHICH COMPRISES USING AS A COCATALYST FROM ABOUT 0.05 TO 5 MOLE PERCENT, BASED ON LACTAM, OF 2,2,4,4-TETRAMETHYL-1,3-CYCLOBUTANEDIONE.
References Cited (Backward Citations)
US3017391A
Cited
US3060135A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-09-20 | 1969-03-22 | 1969-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-20 | 1973-03-22 | 1973-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-20 | 1977-03-22 | 1977-09-21 | $7700.00 | Window Closed / Lapsed |