Baths – closets – sinks – and spittoons – Obstruction remover – Connected to a source of external fluid under pressure
Reexamination Certificate
2005-05-17
2005-05-17
Fetsuga, Robert M. (Department: 3751)
Baths, closets, sinks, and spittoons
Obstruction remover
Connected to a source of external fluid under pressure
C004S255040
Reexamination Certificate
active
06892401
ABSTRACT:
A compressed air tool for unclogging drains includes an air chamber for storing compressed air. A one-way air inlet is fluidly coupled to the air chamber. An outlet valve selectively allows compressed air from the air chamber to enter a tube fluidly coupled to the air chamber. A free end of the tube may be positioned in the drain. A first check valve and a second check valve are each fluidly coupled to the air chamber and are each positionable in a retracted position or an extended position. Both of the first and second check valves are biased in the retracted position. The first check valve is urged into the extended position when compressed air positioned in the air chamber is equal to a first pressure. The second check valve is urged into the extended position when compressed air positioned in the air chamber is at least 10 psi greater than the first pressure.
REFERENCES:
patent: 669819 (1901-03-01), Brooks
patent: 1994526 (1935-03-01), McCloskey
patent: 2059785 (1936-11-01), Gaik
patent: 2380884 (1945-07-01), Osborne et al.
patent: 2635628 (1953-04-01), Stamper
patent: 4063317 (1977-12-01), Santore
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patent: D404178 (1999-01-01), Wetzler
patent: 5940897 (1999-08-01), James
patent: 6032301 (2000-03-01), Wang
patent: 6434760 (2002-08-01), Montalvo
The American Heritage Dictionary, p. 1336.
Website page printout from www.siemag.net/shfdp.htm, 1 pg.
Website page printout from www.missvickie.com/library/2ndgeneration.html, 2 pgs.
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