Compressed air drain opening device

Baths – closets – sinks – and spittoons – Obstruction remover – Piston

Reexamination Certificate

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Details

C004S255110

Reexamination Certificate

active

06862753

ABSTRACT:
An air plunger is described. The air plunger comprises an upper barrel and a lower barrel slidably received by the upper barrel. An air seal is fixed to the lower barrel and slidably engages with the upper barrel. A nozzle is attached to the lower barrel opposite to the upper barrel. A stop mechanism prohibits the upper barrel from disassociating with the lower barrel.

REFERENCES:
patent: 717572 (1903-01-01), Hellums et al.
patent: 766734 (1904-08-01), Schellhammer
patent: 886353 (1908-05-01), Darling
patent: 1583170 (1926-05-01), Pervier
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patent: 1706315 (1929-03-01), Norton
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patent: 3934280 (1976-01-01), Tancredi
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patent: D292631 (1987-11-01), Tash
patent: 5199114 (1993-04-01), Christopher
patent: D364251 (1995-11-01), Novak
patent: 5522094 (1996-06-01), Balazs
patent: 5940897 (1999-08-01), James
patent: 2371588 (1978-07-01), None

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