Patent US2157408A successfully refreshed from Google Patents.
US2551702A
Expired / Lapsed
US
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Process for the production of polyamides by polymerization of lactams
Assignee: BATA NARODNI PODNIK
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Filing: 1947-05-17
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Granted: 1951-05-08
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Expires: 1967-05-17
Abstract
No abstract record available.
Inventors
- 👤 Prochazka Jiri
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:13
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/08; C08G69/14; C08G69/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
37 words
PROCESS FOR PRODUCING POLYAMIDES CONSISTING OF POLYMERIZING 6-CAPROLACTAM IN THE PRESENCE OF A CATALYST SELECTED FROM THE GROUP CONSISTING OF LACTIC ACID, DILACTIC ACID AND LACTIDE IN AN AMOUNT OF BETWEEN 1 AND 5% OF SAID 6-CAPROLACTAM.
Claim 2
Dependent Claim
37 words
PROCESS FOR PRODUCING POLYAMIDES CONSISTING OF POLYMERIZING 6-CAPROLACTAM IN THE PRESENCE OF A CATALYST SELECTED FROM THE GROUP CONSISTING OF LACTIC ACID, DILACTIC ACID AND LACTIDE IN AN AMOUNT OF BETWEEN 1 AND 5% OF SAID 6-CAPROLACTAM.
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) | 1954-05-07 | 1954-11-06 | 1955-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-07 | 1958-11-06 | 1959-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-07 | 1962-11-06 | 1963-05-08 | $7700.00 | Window Closed / Lapsed |