Inventor
John D. Harnden, Jr.
Inventor
Schenectady, NY, US
Overview
Patents· 34 as inventor
Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.
H01Hprimary
H01HElectric switches34%
G01RMeasuring electric variables10%
Y10TTechnical subjects covered by former us classification10%
H10NElectric solid-state devices not otherwise provided for7%
G01KMeasuring temperature3%
G01LMeasuring force, stress, torque, work, mechanical power, mechanical efficiency, or fluid pressure3%
Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests3%
B32BLayered products, i.e. products built-up of strata of flat or non-flat, e.g. cellular or honeycomb, form2%
F24CDomestic stoves or ranges2%
F25BRefrigeration machines, plants or systems2%
PatentTitleYear
5,235,159'Control system, method of operating a heating apparatus and controlled heating apparatus'1993RE033691'Piezoelectric ceramic switching devices and systems and method of making the same'1991RE033618'Method for initially polarizing and centering a piezoelectric ceramic switching device'1991RE033587'Method for (prepolarizing and centering) operating a piezoceramic power switching device'1991RE033577'Advanced piezoceramic power switching devices employing protective gastight enclosure and method of manufacture'1991RE033568'Piezoelectric ceramic switching devices and systems and methods of making the same'19914,967,568'Control system, method of operating an atmospheric cooling apparatus and atmospheric cooling apparatus'19904,819,126'Piezoelectic relay module to be utilized in an appliance or the like'19894,764,714'Electronic starting circuit for an alternating current motor'19884,755,706'Piezoelectric relays in sealed enclosures'19884,742,263'Piezoelectric switch'19884,714,847'Advanced piezoeceramic power switching devices employing protective gastight enclosure and method of manufacture'19874,697,118'Piezoelectric switch'19874,689,517'Advanced piezoceramic power switching devices employing protective gastight enclosure and method of manufacture'19874,680,840'Method for prepolarizing and centering a piezoceramic power switching device'19874,678,957'Piezoelectric ceramic switching devices and systems and methods of making the same'19874,669,160'Method for prepolarizing and centering a piezoelectric ceramic switching device'19874,670,682'Piezoelectric ceramic switching devices and systems and method of making the same'19874,658,154'Piezoelectric relay switching circuit'19874,626,698'Zero crossing synchronous AC switching circuits employing piezoceramic bender-type switching devices'19864,584,525'Current-shunt system for known conductors'19864,561,314'Magnetoelastic force/pressure sensor'19854,559,496'LCD Hook-on digital ammeter'19854,546,658'Piezoelectric force/pressure sensor'19854,489,234'Radiant-energy heating and/or cooking apparatus with honeycomb coverplate'19844,471,300'LDC Hook-on digital ammeter'19844,438,396'Low cost volt/ampere meter with liquid crystal display'19844,360,847'Diode assisted relay contactor'19824,310,837'Electrical device termination high temperature indicator'19824,300,392'Interchangeable networks with non-linear sensors and method of producing such networks'19814,145,708'Power module with isolated substrates cooled by integral heat-energy-removal means'19794,070,701'Inverter power supply'19784,068,281'Thermally responsive metal oxide varistor transient suppression circuit'19784,060,783'Magnetic circuit and method of making'1977Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1977–1993Patents assigned to GEN ELECTRIC (27)· patent assignee history
1977–1993Based in Schenectady, NY, US· patent location history
1988–1989Patents assigned to PACIFIC BELL (2)· patent assignee history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| GEN ELECTRIC | 27 | 1977–1993 |
| PACIFIC BELL | 2 | 1988–1989 |
Locations
| Location | Patents | Span |
|---|---|---|
| Schenectady, New York, US | 34 | 1977–1993 |