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Enkhuizen, NL
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last 30 patents
Information
Patent Grant
Process for the production of coupling pieces from a thermoplastic,...
Patent number
4,457,886
Issue date
Jul 3, 1984
Polva Nederland B.V.
Petrus M. Acda
B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
Information
Patent Grant
Process for the forming of coupling pieces from a thermoplastic
Patent number
4,394,343
Issue date
Jul 19, 1983
Polva Nederland B.V.
Petrus M. Acda
B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
Information
Patent Grant
High-strength pipe coupling
Patent number
4,097,070
Issue date
Jun 27, 1978
Polva-Nederland B.V.
Petrus Marinus Acda
F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
Information
Patent Grant
High-strength coupling of plastic pipe to metal pipe
Patent number
4,070,042
Issue date
Jan 24, 1978
Polva-Nederland B.V.
Petrus Marinus Acda
F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
Information
Patent Grant
Apparatus for forming a thickened bell end on thermoplastic pipe
Patent number
4,065,243
Issue date
Dec 27, 1977
Polva-Nederland B.V.
Petrus Marinus Acda
B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
Information
Patent Grant
Branch connection
Patent number
4,059,291
Issue date
Nov 22, 1977
Polva Nederland B.V.
Petrus Marinus Acda
F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
Information
Patent Grant
Apparatus for manufacturing an electrowelding component of syntheti...
Patent number
4,040,889
Issue date
Aug 9, 1977
Polva Nederland,BV
Petrus Marinus Acda
B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
Information
Patent Grant
Method of shaping a bell end on thermoplastic pipe
Patent number
4,034,057
Issue date
Jul 5, 1977
Polva-Nederland B.V.
Petrus Marinus Acda
B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
Information
Patent Grant
Tapping tee
Patent number
4,018,464
Issue date
Apr 19, 1977
Polva Nederland B.V.
Petrus Marinus Acda
F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
Information
Patent Grant
Pipe bell end having a thickened portion and apparatus for forming...
Patent number
4,006,757
Issue date
Feb 8, 1977
Polva Nederland B.V.
Petrus Marinus Acda
B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
Information
Patent Grant
Mandril for shaping a bell end on a pipe of thermo-plastic material
Patent number
3,998,578
Issue date
Dec 21, 1976
Polva-Nederland B.V.
Petrus Marinus Acda
B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL