US3799899A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two-step polymerization of lauryllactam without mineral acid catalysts
Assignee: Huels AG
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Filing: 1972-10-11
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Granted: 1974-03-26
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Expires: 1992-10-11
Abstract
Abstract A PROCESS FOR THE TWO-STEP POLYMERIZATION OF LAURYLLACTAM WITHOUT MINERAL ACID CATALYSTS AND OPTIONALLY IN THE PRESENCE OF MONOCARBOXYLIC ACIDS OR POLYCARBOXYLIC ACIDS AS CHAIN REGULATORS WHEREIN THE FIRST STEP IS CARRIED OUT AT A TEMPERATURE OF ABOUT 270-290*C. IN THE PRESENCE OF WATER, UNDER SUPERATOMSPHERIC PRESSURE AND AFTER THE REMOVAL OF WATER THE SECOND STEP IS CARRIED OUT AT A TEMPERATURE OF ABOUT 240-265*C., WHICH IS LOWER THAN THE TEMPERATURE OF THE FIRST STEP.
Inventors
- 👤 R Feinauer
- 👤 K Muller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:16
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-25 | 1977-09-24 | 1978-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-25 | 1981-09-24 | 1982-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-25 | 1985-09-24 | 1986-03-26 | $7700.00 | Window Closed / Lapsed |