Vacuum cuspidor

Details Vacuum cuspidor Vacuum cuspidor

1979-10-05

1981-12-29

Artis, Henry K.

Baths, closets, sinks, and spittoons

Spittoons

Flushing

4264, A61C 1704

Patent

active

043074758

ABSTRACT:
The specification discloses an improved dental cuspidor having a vacuum drain means. The specification also discloses a drain having a drain chamber of which one side is formed by a diaphragm so that when water reaches a given height in the chamber, the diaphragm actuates an air valve to drive a piston to open a drain valve to a vacuum drain.

REFERENCES:
patent: 604218 (1898-05-01), Rosenberg
patent: 1948523 (1934-02-01), Kahlert
patent: 2169324 (1939-08-01), Monnot
patent: 2638670 (1953-05-01), Wyne
patent: 2760596 (1956-08-01), Kellie
patent: 3330292 (1967-07-01), Lansky
patent: 3359575 (1967-12-01), Nielsen
patent: 3384907 (1968-05-01), Lappin et al.
patent: 3426788 (1969-02-01), Bassett
patent: 3653078 (1972-04-01), Buchtel et al.
patent: 3654953 (1972-04-01), Hagdorn

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