Measuring and testing – Volume or rate of flow – Using differential pressure
Reexamination Certificate
1999-10-15
2001-11-27
Fuller, Benjamin R. (Department: 2855)
Measuring and testing
Volume or rate of flow
Using differential pressure
C250S559120, C250S573000, C250S577000, C250S208100
Reexamination Certificate
active
06321604
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to rotameters and more particularly to novel electro-optical apparatus for providing highly accurate readings of a rotameter while providing an apparatus of a simplified and yet compact design.
REFERENCES:
patent: 4298800 (1981-11-01), Goldman
patent: 5144149 (1992-09-01), Frosch
patent: 5185638 (1993-02-01), Conzola et al.
patent: 5223706 (1993-06-01), Swenson, Jr.
patent: 5379651 (1995-01-01), Doolittle
Frick Donald C.
Jackson George R.
Tessarvich Wayne D.
Dickens C
Fuller Benjamin R.
Volpe and Koenig P.C.
World Wide Plastics, Inc.
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