Title: Electret sensing medium having plural sensing units

Abstract: A sensing medium having two sensing units each formed of a layer of poled electret material that is coated on each planar surface with an electrically conductive plate, such sensing units being separated from one another by a thermal insulating layer.

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Inventors: Taylor, Allen L. (Woodbury, MN, US)

Application Number: 550536
Filing Date: 1975-02-18
Publication_date: 1976-07-27
Assignee: Minnesota Mining and Manufacturing Company (St. Paul, MN)
Primary Class(es): 73/766 73/774, 73/DIG4, 307/400, 310/328, 310/331, 310/800
Other Classes:
US Patent Ref:

2614144	Oct, 1952	Howatt	310/8.
2769867	Nov, 1956	Crownover et al.	310/8.
3453432	Jul, 1969	McHenry	73/355.

Other Refs:
Primary Examiner: Woodiel, Donald O.
Assistant Examiner: Shoon, Frederick
Attorney: Alexander, Sell, Steldt & DeLaHunt