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Improvements in or relating to the moulding of thermosetting materials. Franz Karl Goldhard, Daniel Dan Prenn, May 15, 1946: GB577373-A (3 worldwide citation)

577,373. Injection-moulding thermosetting material. GOLDHARD, F. K., and PRENN, D. D. June 29, 1944, No. 12420. [Class 87 (ii)] The material is preheated throughout its mass before the injection operation to a temperature near the softening point but below the polymerization point, is maintained con ...


2
Improvements in or relating to the moulding of plastic substances. Franz Karl Goldhard, Daniel Dan Prenn, November 1, 1946: GB582033-A (1 worldwide citation)

582,033. Injection-moulding and extrusion machines. GOLDHARD, F. K., and PRENN, D. D. June 29, 1944, No. 12421. [Class 87 (ii)] Relates to the heating of thermosetting or thermoplastic material before it is fed to an injection or extrusion moulding device. According to the invention, the amount of m ...


3
Improvements in and relating to the moulding of plastic materials. Franz Karl Goldhard, Daniel Dan Prenn, September 5, 1947: GB592056-A

592,056. Injection-moulding machines. GOLDHARD, F. K., and PRENN, D. D. Feb. 15, 1945, No. 3880. [Class 87 (ii)] The mould is partly filled by a first pressureapplying means, which is then sealed off, and further material is injected under higher pressure by a second pressure-applying means. In the ...


4
Improvements in or relating to injection moulding machines. Franz Karl Goldhard, Daniel Dan Prenn, January 14, 1946: GB574639-A

574,639. Injection-moulding machines. GOLDHARD, F. K., and PRENN, D. D. June 29, 1944. No. 12419. [Class 87 (ii)] In an injection-moulding machine for thermosetting and/or thermoplastic material, a movable die plate is connected with a movable thrust plate, both plates being adapted to be together q ...


5
Improvements in or relating to the injection moulding of plastic substances. Franz Carl Goldhard, Daniel Dan Prenn, September 15, 1949: GB629228-A

629,228. Injection-moulding. GOLDHARD, F. C., and PRENN, D. D. Aug. 8, 1945, Nos. 20323/45 and 3045/46. [Class 87 (ii)] [Also in Group XI] A quantity of thermosetting moulding material that has been heated to its softening point and is slightly in excess of the quantity required for one moulding ope ...