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:
Jan. 18, 1983
Filed:
Jan. 28, 1981
Lewis H Wiens, Johnson County, KS (US);
James R Saylor, Johnson County, KS (US);
Orville E Blume, Buchanan County, MO (US);
Aero Plastics of K.C., Inc., Kansas City, MO (US);
Abstract
A hatch cover for railroad hopper cars and a method of constructing same. The hatch cover includes a main panel and a stepped periphery, both of which are constructed of polyester resin impregnated with glass fiber reinforcement. Stiffening ribs on the panel include a honeycomb core enclosed by a rigid shell formed by glass fiber reinforced resin. The entire periphery of the panel is strengthened by thickening it, and the areas to which the hinges are attached is thickened additionally. The hatch cover is constructed by applying an exterior protective coating to a mold surface, spraying resin and chopped glass fibers into the mold, inserting the honeycomb core portions of the ribs into the mold in a crossing pattern, and spraying additional resin and glass fibers onto the honeycomb to form the shell which encloses the core of each rib.