Baths – closets – sinks – and spittoons – Ventilation – Electric-motor pump
Reexamination Certificate
2000-09-07
2002-03-05
Douglas, Steven O. (Department: 3751)
Baths, closets, sinks, and spittoons
Ventilation
Electric-motor pump
C004S347000, C004S348000, C004S349000, C004S352000
Reexamination Certificate
active
06351855
ABSTRACT:
BACKGROUND
Field of invention is toilet-filtering devices used to clean or process air from the toilet bowl (004/209.R/213).
DESCRIPTION OF PRIOR ART
Referenced patents: U.S. Pat. Nos. 4,993,083, 3,887,949, 5,369,810, 6,052,837, 5,590,423.
There are numerous patents covering this field, however, they all have serious shortcomings concerning being easily installed, fitting toilets without alteration, expense, complexity and other considerations. For example, U.S. Pat. No. 5,606,747 Dupont 1997 is a good idea but in the real world, will fit into only a few toilets without alterations, among other shortcomings of its design. Another good idea is U.S. Pat. No. 5,325,544 Busch 1994, but in reality will fit only a few toilets without alteration, among other shortcomings of its design. Generally, people will not alter their existing appliances.
REFERENCES:
patent: 3887949 (1975-06-01), Osmond
patent: 4031574 (1977-06-01), Werner
patent: 4166298 (1979-09-01), Pearson
patent: 4318192 (1982-03-01), Williams
patent: 4583250 (1986-04-01), Valarao
patent: 4993083 (1991-02-01), Lemieux
patent: 4993949 (1991-02-01), Hill
patent: 5125119 (1992-06-01), Munoz
patent: 5161262 (1992-11-01), Quaintance, Sr.
patent: 5325544 (1994-07-01), Busch
patent: 5369810 (1994-12-01), Warren
patent: 5394569 (1995-03-01), Poirier et al.
patent: 5590423 (1997-01-01), Boykin
patent: 5606747 (1997-03-01), Dupont
patent: 5718005 (1998-02-01), Ng
patent: 5940893 (1999-08-01), Shum
patent: 6052837 (2000-04-01), Norton
Douglas Steven O.
Graham R. William
Huynh Khoa
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