Encapsulated float and method for making same

Details Encapsulated float and method for making same Encapsulated float and method for making same

2005-09-06

2005-09-06

Williams, Hezron (Department: 2856)

Measuring and testing

Liquid level or depth gauge

Float

C073S322500

Reexamination Certificate

active

06938480

ABSTRACT:
A float, including rubber material for sensing liquid levels having a chemically resistant protective covering said float having greater resistance to attach from chemicals, such as hydrocarbons, acids, and chlorinated solvents, said float may be made to include magnets, guiding devices or sensors. Also disclosed is the method for manufacturing the float of this invention including the steps of milling acrylonitrile rubber, phenolic resin, sulfur and various additives in a Banbury mill and mixing at an elevated temperature below 250°, compression molding at up to 900 psi pressure between 250° and 350° F., cooling and filling pre made protective skin container with the mixture, closing the container and heating the sealed container to bond the mixture to the container skin.

REFERENCES:
patent: 4480054 (1984-10-01), Enderle
patent: 6041650 (2000-03-01), Swindler et al.
patent: 50065570 (1975-06-01), None
patent: 59138421 (1984-08-01), None
patent: 62255823 (1987-11-01), None

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