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:
Mar. 07, 1989
Filed:
Oct. 01, 1987
Edward N Caldwell, Knoxville, TN (US);
Dalen Products, Inc., Knoxville, TN (US);
Abstract
A ventilating construction, such as for a cold frame or for other desired structures, and method of making the same are provided, the ventilating construction comprising a sheet of material having an opening therethrough a flap hinged to the sheet for opening and closing the opening. The sheet comprises two like walls of polymeric material disposed in spaced apart substantially parallel relation with a plurality of spaced apart substantially parallel ribs of polymeric material disposed between the walls and interconnected thereto. The flap comprises a section of the sheet cut therefrom to define the opening and having at least part of one edge thereof being uncut so as to be integral and one-piece with one of the walls to provide a natural hinge therewith.