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:
Feb. 05, 1980
Filed:
Oct. 07, 1977
John A Hobson, Minneapolis, MN (US);
Paul K Schilling, St. Paul, MN (US);
H & S Industries, Inc., St. Paul, MN (US);
Abstract
A method and apparatus for the preparation of thermosetting foam products on a substantially continuous basis, and wherein the products are characterized by uniformity of formulation, dimensional accuracy, and dimensional stability. The invention contemplates the utilization of an extruder which receives raw, partially or fully expanded resin and fillers or additives at inlets thereof, with initial expansion occurring within the confines of the extruder. The initially expanded resin is passed through a first expansion chamber with an intermediate expansion zone therein, with the outlet from the first expansion chamber being modestly constricted. From the first expansion chamber, the partially or fully expanded resinous product is moved through a second expansion chamber wherein the intermediate zone is enlarged, so as to permit substantially full expansion of the resinous material therewithin. From the second expansion chamber, the resinous material is passed through an outlet port in the form of an extrusion die, and received on a product receiving surface with a configuration substantially matching the configuration of the extrusion die for supporting the substantially completely expanded resin therein until cured to a self-supporting state.