Patent US3109129A successfully refreshed from Google Patents.
Patent US2562797A successfully refreshed from Google Patents.
US2562797A
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Process for the preparation of polyamides from caprolactam
Assignee: Akzona Inc
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Filing: 1949-06-28
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Granted: 1951-07-31
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Expires: 1969-06-28
Abstract
No abstract record available.
Inventors
- 👤 Koch Theodoor
- 👤 Benninga Noach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:30
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/08; C08G69/14; C08G69/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
43 words
A SINGLE-STAGE PROCESS FOR THE POLYMERISATION OF CAPROLACTAM TO A HIGH MOLECULAR WEIGHT LINEAR POLYAMIDE COMPRISING HEATING THE COPROLACTAM WITH FROM 0.5% TO 5% OF FORMIC ACID, BASED ON THE WEIGHT OF CAPROLACTAM, TO A TEMPERATURE LYING BETWEEN APPROXIMATELY 150* AND 300* C.
Claim 2
Dependent Claim
43 words
A SINGLE-STAGE PROCESS FOR THE POLYMERISATION OF CAPROLACTAM TO A HIGH MOLECULAR WEIGHT LINEAR POLYAMIDE COMPRISING HEATING THE COPROLACTAM WITH FROM 0.5% TO 5% OF FORMIC ACID, BASED ON THE WEIGHT OF CAPROLACTAM, TO A TEMPERATURE LYING BETWEEN APPROXIMATELY 150* AND 300* C.
References Cited (Backward Citations)
US2241322A
Cited
FR870484A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-07-30 | 1955-01-29 | 1955-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-07-30 | 1959-01-29 | 1959-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-07-30 | 1963-01-29 | 1963-07-31 | $7700.00 | Window Closed / Lapsed |