1
Borge I Carlstrom: Glass fiber reinforced pipe. Hobas Engineering, McGlew and Tuttle, February 13, 1979: US04139025 (32 worldwide citation)

A glass fiber reinforced multilayer pipe of plastic, comprises a wall having a plurality of plastic layers interconnected together and having a central wall axis with a median area on each side of the axis directly adjacent the axis and with an outer area radially outwardly from said median area, an ...


2
Borge Carlstrom, Peter Kunze, Johann Mitteregger: Sockets serving for the connection of two plastic pipes. Hobas Engineering, McGlew & Tuttle, June 2, 1998: US05758906 (25 worldwide citation)

The socket has an essentially cylindrical outer layer of glass fiber-reinforced plastic and a sealing sleeve arranged in a recess in the outer layer. This sealing sleeve has, between the two socket ends, a rib serving as a stop for the ends of the two pipes to be connected to one another. Here, the ...


3
Borge I Carlstrom: Reinforced tube of plastic and a method of manufacturing the same. Hobas Engineering, McGlew and Tuttle, September 18, 1979: US04167953 (16 worldwide citation)

A reinforced tube or a tubular pipe comprises an inner tubular first layer of glass fiber reinforced plastic, an outer tubular second layer disposed around and spaced radially outwardly from the first layer and also comprising a glass fiber reinforced plastic, and an intermediate filler layer locate ...


4
Ralf Jost, Reinhart Ratheiser: Process for manufacturing reinforced duroplastic pipes in a centrifugal process and installation for carrying out the process. Hobas Engineering, McGlew and Tuttle, October 11, 1994: US05354526 (9 worldwide citation)

To eliminate the fluctuations in the precision of the material distribution which could not be avoided when manufacturing pipes in the centrifugal moulding process with the prior art installations, a new process and an installation for carrying out the process is proposed. This has at least two cyli ...


5
Ralph Jost: Splash-proof bearing arrangement having a horizontal axis. Hobas Engineering, McGlew and Tuttle, February 22, 1994: US05288154 (7 worldwide citation)

The bearing arrangement is suitable in particular for the mounting of molds for the production of plastic pipes by the centrifugal molding process. It has a ball bearing whose inner bearing ring (5) sits on the pipe (3) which is to be freely rotatably mounted and whose outer bearing ring (7) is held ...


6
Borge Carlstrom: Coupler for connecting two plastic pipes and process and mold for producing the coupler. Hobas Engineering, McGlew & Tuttle, July 19, 1994: US05330238 (4 worldwide citation)

The coupler consists of an essentially cylindrical outer layer of glass fiber-reinforced plastic and an inner layer consisting of polyurethane. This inner layer has, approximately in the middle between the two coupler ends, a rib which serves as a stop for the ends of the two pipes to be connected t ...


7
Walter Wyss: Coupling for plastic pipe formed by centrifugal casting. Hobas Engineering & Durotec, MgGlew & Tuttle, October 8, 1991: US05054824 (4 worldwide citation)

To produce an integrated coupling on pipes manufactured according to the centrifugal casting process, insert rings made of soft PVC are placed into the end parts of the pipe shell mode. In the recess (5a) of one end part (4a), a coupling sleeve (7) is produced by wrapping on a laminate. A recess (5b ...


8
Borge Carlstrom: Method for producing multi-layer pipe conduit components of plastic material, inorganic filler material and glass fibers. Hobas Engineering & Durotec, McGlew and Tuttle, April 13, 1993: US05202076 (4 worldwide citation)

A rotating mold is fed with a flowable mixture of an inorganic filler material powder and a polyester resin for the purpose of generating or building up individual layers. By selecting the rotating speed during the layer buildup a more or less pronounced separation between resin and filler material ...


9
Ralph Jost: Tube coupling. Hobas Engineering, McGlew and Tuttle, April 30, 1985: US04513996 (3 worldwide citation)

A tube coupling for coupling together one tube to another tube which have predetermined interior and exterior diameters comprises an outer sleeve which has an interior bore with a sealing element lining the bore of an elastic material. The sealing element has an exterior positively engaged sleeve an ...


10
Borge Carlstrom: Multi-layer pipe conduit having components of plastic material, inorganic filler material and glass fibers. Hobas Engineering, McGlew and Tuttle, November 8, 1994: US05362528 (3 worldwide citation)

A rotating mold is fed with a flowable mixture of an inorganic filler material powder and a polyester resin for the purpose of generating or building up individual layers. By selecting the rotating speed during the layer buildup a more or less pronounced separation between resin and filler material ...