Patent US4722652A successfully refreshed from Google Patents.
Patent US3676544A successfully refreshed from Google Patents.
US3676544A
Copy Number
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of polyamide mouldings
Assignee: Bayer AG
•
Filing: 1970-05-20
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Granted: 1972-07-11
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Expires: 1990-05-20
Overview & Biblio
Claims (8)
Citations (2)
Maintenance Schedule (3)
Categories & Tags (0)
Abstract
Abstract This invention relates to a process for the production of polyamide mouldings which comprises polymerizing a mixture consisting of a lactam, a catalyst and an activator in a screw injection moulding machine, said mixture being delivered to said screw injection moulding machine under the effect of an external pressure. The mixture is delivered at a pressure of at least 2 atms. under the influence of a pressure generator through a feed opening to the feed zone and a screw injection moulding machine and is polymerized in the injection moulding machine to form a polyamide at a temperature above the melting temperature of the polyamide and the resulting polyamide melt is forced by the injection moulding machine into a mould.
Inventors
👤 Klaus Reinking
👤 Helmut Vogel
👤 Wilheim Hechelhammer
👤 Kurt Schneider
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:44
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/08; C08G69/14; C08G69/16; C08G69/18; B; B29; B29C; B29C45/00; B29C45/0001
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
12 words
The process is claimed in claim 1, wherein said lactam is caprolactam.
Claim 2
Dependent Claim
13 words
The process as claimed in claim 1, wherein said lactam is lauric lactam.
Claim 3
Dependent Claim
25 words
The process as claimed in claim 1, wherein the polymerizable mixture is fused in the feed opening immediately preceding the feed zone of the screw.
Claim 4
Dependent Claim
15 words
The process as claimed in claim 1, wherein said pressure generator is a screw extruder.
Claim 5
Dependent Claim
15 words
The process as claimed in claim 1, wherein said pressure generator is a piston pump.
Claim 6
Dependent Claim
15 words
The process as claimed in claim 1, wherein said pressure generator is a gear pump.
Claim 7
Dependent Claim
22 words
The process as claimed in claim 1, wherein said pressure generator is a container under the excess pressure of an inert gas.
Claim 8
Dependent Claim
16 words
The process as claimed in claim 1, wherein said pressure is from 4 to 8 atms.
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) 1975-07-11
1976-01-10 1976-07-11
$2000.00
Window Closed / Lapsed
7.5 Years (Year 8) 1979-07-11
1980-01-10 1980-07-11
$3760.00
Window Closed / Lapsed
11.5 Years (Year 12) 1983-07-11
1984-01-10 1984-07-11
$7700.00
Window Closed / Lapsed