Measuring and testing – Liquid level or depth gauge – Sight glass
Reexamination Certificate
1998-09-30
2001-04-24
Fuller, Benjamin R. (Department: 2855)
Measuring and testing
Liquid level or depth gauge
Sight glass
C034S089000, C116S274000
Reexamination Certificate
active
06220092
ABSTRACT:
BACKGROUND OF THE INVENTION
Clothes dryers are well known and generally perform as expected. There are, however, some persistent operational complaints which often result in the calling of a repair person to fix. Among these often hear complaints are that: the dryer takes too long to dry the clothing; the dryer is heating but not drying the clothes; the user needs to run the dryer twice before the clothing get dry; and the dryer is too warm but the clothing is still damp. The root causes of these common complaints is that the exhaust vent system for the heated gas or electric dryer has become either partially or completed obstructed by lint and other material. All of these common dryer problems can easily be repaired at a modest cost once the cause of the problem is known.
The present invention is directed to an invention specify designed to be used by a homeowner to test whether there is any blockage of a clothes dryer's exhaust vent system which then permits the solving of the recited dryer problems without having to call a repair person as will be described hereafter.
DESCRIPTION OF THE PRIOR ART
Devices used to measure gas flow for are known. For example, in the Knauth invention (U.S. Pat. No. 2,915,606) a flowmeter is disclosed which translates rotary motion of a shaft to linear motion outside of the flow passage without providing a mechanical connection through the wall of the flow passage.
The Keerie patent (U.S. Pat. No. 3,953,819) discloses a flow sensor for producing an electrical signal dependent upon fluid flow has a housing insertable in a bore extending transversely to and intersecting a flow passage in a port plate.
In U.S. Pat. No. 4,147,057 to Palmer a wind component anemometer for measuring the component of air or fluid speed along its axis of rotation where there is disclosed a plurality of generally radially directed helicoidal airfoils.
In the Franklin et al. reference (U.S. Pat. No. 5,721,383) there is disclosed a flow meter system and method for detecting the movement of a substance through a conduit with a sensing device partially within the flow path.
The present invention relates to a flow tester used with a clothes dryer to detect whether there is no, a total or a partial blockage of the dryer's air flow exhaust vent path all as more fully set forth in this specification.
SUMMARY OF THE INVENTION
This invention relates to an air flow testing device used with a clothes dryer to indicate the degree, if any, of the passage of air from the dryer's exhaust vent.
It is the primary object of the present invention to provide for a simple air flow testing device that can easily be used with a clothes dryer to detect degrees of obstruction of the exhaust venting system.
Another object is to provide for such a device wherein the testing device has a housing made of a clear transparent material to permit the viewing of an internal impeller.
These and other objects and advantages of the present invention will become apparent to readers from a consideration of the ensuing description and the accompanying drawings.
REFERENCES:
patent: 2915606 (1959-12-01), Knauth
patent: 3185128 (1965-05-01), Moore et al.
patent: 3953819 (1976-04-01), Keerie et al.
patent: 4147057 (1979-04-01), Palmer
patent: 4227315 (1980-10-01), Heght
patent: 4745877 (1988-05-01), Chang
patent: 4793190 (1988-12-01), Chang
patent: 5042170 (1991-08-01), Hauch et al.
patent: 5249464 (1993-10-01), Brown et al.
patent: 5497563 (1996-03-01), Mayfield
patent: 5645011 (1997-07-01), Winkler et al.
patent: 5664339 (1997-09-01), Swanson et al.
patent: 5721383 (1998-02-01), Franklin et al.
Fuller Benjamin R.
McGlynn Joseph H.
Patel Jagdish
Patent & Trademark Services
Zack Thomas
LandOfFree
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