The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 18, 1976
Filed:
Apr. 14, 1972
William B Goldsworthy, Palos Verdes Estates, CA (US);
Ethridge E Hardesty, Pine Valley, CA (US);
Goldsworthy Engineering, Inc., Torrance, CA (US);
Abstract
Reinforced plastic pipe and similar tubular members are formed by centrifugally casting filamentary strand materials, such as glass roving, in a rotating cylindrical mold. A solvent dispersed mold release agent may be sprayed into the mold prior to the application of the filament. Thereafter, a spray of catalyzed binder resin is added to the filamentary material. A lance is extended into the mold and contains feeding tubes for depositing the filamentary strand, as well as nozzles for depositing the resin on the surface of the mold. Also, the lance contains extra nozzles for the addition of particulate matter such as sand to achieve desired structural quality and economic fabrication of the tubular member. The amount of the components added and the timing of the component addition is determined by the desired end product to be achieved.