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:
Sep. 26, 1995
Filed:
Jan. 05, 1994
Applicant:
Inventors:
Paul J Charland, New Richmond, WI (US);
Anthony J Schommer, Cottage Grove, MN (US);
Assignee:
Minnesota Mining and Manufacturing Company, Saint Paul, MN (US);
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F16L / ; F16K / ; E04C / ;
U.S. Cl.
CPC ...
52232 ; 52-1 ; 522208 ;
Abstract
The invention relates to a firestop assembly for a pipe, comprising first and second intumescent firestop rings. The first intumescent firestop ring overlies the pipe, and extends along the pipe for a first distance, and the second intumescent firestop ring overlies the first intumescent firestop ring and extends along the pipe for a second distance. The first distance is not equal to the second distance, and the firestop assembly so provided is particularly adapted for firestopping a plastic pipe.