Thomas I Perkins

US Patent:

53816943, Jan 17, 1995

Filed:

Sep 29, 1992

Appl. No.:

7/953510

Inventors:

Dennis P. Glynn - Chester NH
John C. Joseph - Merrimack NH
Thomas O. Perkins - Bedford NH

Assignee:

Dedicated Electronics - Chester NH

International Classification:

G01B 1702

US Classification:

73627

Abstract:

The disclosure defined by this invention utilizes electromagnetic energy reflected from the top and bottom surfaces of ice, the thickness of which is being measured, to determine a phase difference that indicates the thickness of the ice. Since there will be many wave lengths of the electromagnetic energy in the ice, two measurement frequencies are utilized. Integers of wavelengths of each frequency are added to the readings for each frequency to derive sets of numbers. The one number in the set of readings for each frequency that are the same in each set indicate the actual thickness of the ice.

US Patent:

44347456, Mar 6, 1984

Filed:

Sep 30, 1982

Appl. No.:

6/431315

Inventors:

Noel Perkins - Northwood NH
Thomas Perkins - Gloucester MA

International Classification:

A01K 500

US Classification:

119 51R

Abstract:

A bird feeding device is disclosed which can be accessed by birds and not by squirrels. The device comprises a container for holding feed and a wire mesh enclosing the container. An o-ring supports the container within the wire mesh and spaces the mesh away from the container such that the mesh is not directly in contact with the container whereby squirrels are prevented from accessing the container.