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:
Jun. 14, 1977
Filed:
Sep. 23, 1976
Applicant:
Inventor:
Richard L Stone, Los Altos Hills, CA (US);
Assignee:
Wallace-Murray Corporation, Belmont, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F16L / ;
U.S. Cl.
CPC ...
285 47 ; 138148 ; 2851 / ; 285373 ;
Abstract
A prefabricated metal chimney formed of double wall sections which can be connected so that the inner pipe joints are substantially air or smoke tight. The inner pipes of adjacent sections have end flanges which engage and are held together by an inner band member. Attached near each opposite end of the outer wall member for each section is a spacer band with circumferentially spaced apart tab means. Inter tab means extend radially outwardly from the band and is fixed to the outer pipe wall while inner tab means is held to the inner pipe by the inner band member.