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:
Nov. 21, 2000
Filed:
May. 20, 1994
Bruce G Barton, Jr, Whitmore Lake, MI (US);
Other;
Abstract
Apparatus for creating a sleeveless passage of controlled size and shape through a concrete wall poured in a form including two form plates mounted in fixed, spaced relation separated by a width W comprises a plurality of modular, one piece passage units, each unit including an annular main shell of external size and shape conforming to a segment of the sleeveless passage; each unit has end closure walls closing the ends of the main shell. Each modular unit has an axial length L1 that is smaller than W. Each modular unit also has interlock elements that interconnect with another like modular unit so that the main shells of the units can be aligned with each other in one integral assembly between the two form plates.