JOHN R HEBERT
Broker in Clarksburg, MA
License number
Massachusetts 3607
Issued Date
Jan 1, 1960
Expiration Date
Jul 19, 1977
Type
Broker
Address
Address
Clarksburg, MA
Personal information
See more information about JOHN R HEBERT at radaris.comName
Address
Phone
45 Biddle St, Springfield, MA 01129
41 Burbank Rd, Sutton, MA 01590
46 Roberts Pond Ln, Chicopee, MA 01020
4 Spring St, Danvers, MA 01923
402 Palmer Rd, Ware, MA 01082
Professional information
Transformerless Power Inverter With Only One Type Transistors
US Patent:
4533989, Aug 6, 1985
Filed:
Mar 10, 1980
Appl. No.:
6/129048
Inventors:
John R. Hebert - Clarksburg MA
Assignee:
Sprague Electric Company - North Adams MA
International Classification:
H02M 7537
US Classification:
363132
Abstract:
A full transistor bridge power inverter employs a single untapped DC power supply and no transformer, and includes four power bridge NPN transistors and a simple two NPN transistor commutating circuit. The two commutating transistors are driven from a source providing two square wave signals 180. degree. out of phase with each other. This inverter is capable of driving with a square wave voltage, inductive, resistive and capacitive loads.
Method For Controlling Etching Of Electrolytic Capacitor Foil
US Patent:
4343686, Aug 10, 1982
Filed:
Feb 27, 1981
Appl. No.:
6/239093
Inventors:
John R. Hebert - North Adams MA
Joseph H. Silveira - Cheshire MA
Robert W. Herzig - North Adams MA
Joseph H. Silveira - Cheshire MA
Robert W. Herzig - North Adams MA
Assignee:
Sprague Electric Company - North Adams MA
International Classification:
C25F 302, H01L 21306, B44C 122
US Classification:
2041292
Abstract:
In a process for etching aluminum foil to increase its actual surface area to apparent surface area for use as an electrode in an electrolytic capacitor, a wire coil is placed adjacent the foil as it exits the etch station. The coil is energized to produce eddy currents in the foil. The voltage induced by theses eddy currents is sensed at the same coil or another coil. The foil drawing speed through the etch station is altered in response to that sensed voltage, or another process parameter is changed, to maintain at a constant value the ratio of the actual to apparent foil surface area.