Pipe joints or couplings – End to side or plate – Countersunk packed
Patent
1976-10-29
1978-03-14
Schroeder, Werner H.
Pipe joints or couplings
End to side or plate
Countersunk packed
277112, 277113, 285158, 285348, F16L 500
Patent
active
040788342
ABSTRACT:
A wall duct assembly is disclosed comprising a duct piece or unit having arranged on its outside diameter retaining grooves for sealing structures. The sealing structures can be adjusted through the aid of pressure rings to provide effective sealing of the duct unit in walls or like structures.
REFERENCES:
patent: 1364814 (1921-01-01), Saucke
patent: 2525799 (1950-10-01), Hecker
patent: 2744559 (1956-05-01), Leonetti
patent: 3261624 (1966-07-01), Hackman
patent: 3612578 (1971-10-01), Bagnulo
Cohen Moshe I.
Ross Karl F.
Schroeder Werner H.
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