Vernitron Corporation

Glenn N Howatt

Murray Leonard

David J Horvath

In the manufacture of wave filters, such as FM filters, polarized piezoelectrically responsive wafers are provided, temporarily, on the active regions thereof, with a removable material. Subsequent to the encapsulation of the wafer by a protective but porous coating, the filter is heated and the removable material sublimates through the porous coating establishing a wafer surface substantially free of residual impurities and leaving an uninterrupted cavity between the wafer and the coating in the active regions. The preferred sublimatable material is paradichlorobenzene.

Wave filter and process for making same

A piezoelectric ignition system for a plurality of gas burners includes an elongated adjustably mounted flash tube of high temperature resistant dielectric material mounted adjacent each burner. A pair of electrodes are mounted on each flash tube in spaced-apart relationship to define spark gaps, and are electrically connected in series with one another across opposite sides of a single piezoelectric voltage source. The system is adapted to accommodate heavier and lighter than air combustible gases.

Growing community of inventors

Metuchen, NJ, United States of America

Glenn N Howatt