Pipe fitting plug

Details Pipe fitting plug Pipe fitting plug

2007-02-06

2007-02-06

Hook, James (Department: 3754)

Pipes and tubular conduits

With closures and plugs

C138S090000

Reexamination Certificate

active

10734471

ABSTRACT:
A reusable pipe fitting plug for temporarily sealing the open hub on a non-threaded female pipe fitting. The pipe fitting plug has a retainer with piercing edges, expandable pins or grit type particles designed to engage the inner portion of a pipe fitting hub in order to anchor the pipe fitting plug. The pipe fitting plug further has an expandable rubber seal or expandable rubber bladder designed to provide a watertight seal.

REFERENCES:
patent: 411978 (1889-10-01), Chisholm
patent: 646804 (1900-04-01), Clark
patent: 2375995 (1945-05-01), Kaeser
patent: 2475748 (1949-07-01), Leroy
patent: 2824577 (1958-02-01), Grunsky
patent: 3886977 (1975-06-01), Dorgebray
patent: 4381800 (1983-05-01), Leslie
patent: 4474216 (1984-10-01), Noe
patent: 4493344 (1985-01-01), Mathison et al.
patent: 4760868 (1988-08-01), Saxon
patent: 4817671 (1989-04-01), Mathison et al.
patent: 5636662 (1997-06-01), Olson

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