John H Wilkinson

7251899, Aug 7, 2007

Jan 18, 2006

11/335187

Richard Yandrick - Sellersville PA, US
Edward Wilkinson - Spring City PA, US
John Wilkinson - Phoenixville PA, US

Wilkinson & Associates, Inc. - Valley Forge PA

G01C 15/06

33294

A direct reading prism pole has a tubular housing having an open top, a flange at the open top, a conical bottom portion for wedging the tubular housing into ground soil, a height-adjusting rod partially inserted into the tubular housing by a friction fit, a lip positioned at the top of height-adjustable rod, a laser sensor mounted to the outer surface of the tubular housing for emitting a laser toward the lip to take height measurements of the distance between the laser sensor and the lip, an electronic control unit for receiving the height measurements and providing height reference data, an electronic display for displaying the height reference data, an audio device for emitting an alarm indicating movement of the height-adjusting rod with respect to the tubular housing, and an output device for sending the height reference data to a data collection device.

7788815, Sep 7, 2010

Aug 6, 2007

11/890792

Richard Yandrick - Sellersville PA, US
Edward Wilkinson - Spring City PA, US
John Wilkinson - Phoenixville PA, US

Wilkinson & Associates - Valley Forge PA

G01C 15/06

33294

A prism pole has a tubular housing having an open top, a flange at the open top, a bottom portion for contacting ground soil, a height-adjustable rod insertable into the tubular housing with an outer diameter less than inner diameter of the tubular housing to provide a slidable friction fit therebetween for positioning the height-adjustable rod with respect to the tubular housing, a lip at the top of the rod, a laser sensor mounted on the tubular housing for emitting a laser toward the lip to measure distance between the laser sensor and the lip, an electronic control unit in electrical communication with the laser sensor for receiving height measurements and providing height reference data corresponding to the height measurements, an electronic display in electrical communication with the electronic control unit for receiving the height reference data and displaying the height reference data, an audio device in electrical communication with the electronic control unit for emitting an alarm in response to receipt of a signal from the electronic control unit indicating movement of the height-adjustable rod with respect to the tubular housing, and an output device in electrical communication with the electronic control unit for sending the height reference data to a data collection device.

40385841, Jul 26, 1977

Jun 15, 1976

5/696211

Edward Tarchalski - Lawrenceville NJ
John C. Wilkinson - Hightstown NJ

Heinemann Electric Company - Trenton NJ

H02H 720

361104

This invention comprises a fusible resistor in a solid state relay comprising two solid state switches connected in parallel with each other, but in series with a load and a source of current. When the first of the two switches is switched on, the second switch also switches on, and conducts, supplying sufficient current to the load, thus reducing the voltage across both switches to that of the voltage drop across the second switch. Should the second switch fail to become turned on when the first switch is turned on, there will be a higher voltage across the first switch (and the components in series with it, if any) causing excessive current to flow through the first switch, resulting in its overheating and possibly fire, particularly if the switch is encapsulated. By providing a fusible resistor in the circuit of the first switch, the fusible resistor will open at such time and disconnect the first switch from the circuit, preventing a possible fire or possible damage to adjacent equipment.