US3027355A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus and method for the continuous production of polyamides
Assignee: Glanzstoff AG
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Filing: 1958-03-20
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Granted: 1962-03-27
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Expires: 1978-03-20
Abstract
No abstract record available.
Inventors
- 👤 Taul Horst
- 👤 Wiloth Fritz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:12
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/26; C08G69/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
59 words
PROCESS FOR THE CONTINUOUS PRODUCTION OF POLYAMIDES FROM AQUEOUS DISPERSIONS OF THEIR PRECURSOR DICARBOXYLIC ACID-DIAMINE SALTS WHICH COMPRISES EVAPORATING WATER AS STEAM FROM SAID AQUEOUS SALTS UNDER SUPER-ATMOSPHERIC PRESSURE AT A TEMPERATURE NOT ABOVE ABOUT 275*C. TO A WATER CONTENT NOT GREATER THAN ABOUT 15% BY WEIGHT THEREOF IN A FIRST ZONE AND REDUCING THE PRESSURE TO AT LEAST
Claim 2
Dependent Claim
59 words
PROCESS FOR THE CONTINUOUS PRODUCTION OF POLYAMIDES FROM AQUEOUS DISPERSIONS OF THEIR PRECURSOR DICARBOXYLIC ACID-DIAMINE SALTS WHICH COMPRISES EVAPORATING WATER AS STEAM FROM SAID AQUEOUS SALTS UNDER SUPER-ATMOSPHERIC PRESSURE AT A TEMPERATURE NOT ABOVE ABOUT 275*C. TO A WATER CONTENT NOT GREATER THAN ABOUT 15% BY WEIGHT THEREOF IN A FIRST ZONE AND REDUCING THE PRESSURE TO AT LEAST
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) | 1965-03-26 | 1965-09-25 | 1966-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-03-26 | 1969-09-25 | 1970-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-03-26 | 1973-09-25 | 1974-03-27 | $7700.00 | Window Closed / Lapsed |