Pipe joints or couplings – Frangible element
Patent
1992-04-20
1993-08-31
Arola, Dave W.
Pipe joints or couplings
Frangible element
285 12, 285176, 285197, 285423, 29412, 138109, 138 89, F16L 3500
Patent
active
052402886
ABSTRACT:
A double air duct boot which includes a pair of identical opposed severable parts, joined through a central section. The two parts are geometrically symmetrical about the central section which joins the two parts. The central section includes a pair of identical halves joined at a central plane. The central section includes a pair of opposed segments of a cylinder constituting spaced, arcuate opposed side walls and a pair of opposed transverse walls joining the opposed arcuate side walls and lying in parallel planes. The central section is completed by a pair of elongated parallel end walls which extend perpendicular to the transverse walls to complete the closure of the central section. Each of the opposed severable parts includes a tapered riser section joined to the central section through an intermediate, optionally usable, arcuate duct mating section.
REFERENCES:
patent: 24660 (1859-07-01), Potts
patent: D314820 (1991-02-01), Sullivan
patent: 567231 (1896-09-01), Glauber
patent: 925762 (1909-06-01), Eager
patent: 1908821 (1933-05-01), Cornell, Jr.
patent: 2086007 (1937-07-01), Tompkins
patent: 2215318 (1940-09-01), Bristol
patent: 3610288 (1971-10-01), Carr
patent: 3645566 (1972-02-01), Dyck
patent: 4067353 (1978-01-01), DeHoff
patent: 4491349 (1985-01-01), Rice et al.
patent: 4750411 (1988-06-01), Eversole
patent: 4773197 (1988-09-01), Sullivan
patent: 5036636 (1991-08-01), Hasty
patent: 5080403 (1992-01-01), Paolyccio
Exhibit A-Photograph of prior air duct riser.
Exhibit B-Photograph of prior air duct riser.
Sales information from Northern Pipe Products and GPK Products, Inc. (Undated but believed to be prior art to the present application).
Inda John P.
Inda Joseph J.
Arola Dave W.
Chun Heather
General Plastics Inc.
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