Stuart O Sigafoos, 733341 Morro Hill Rd, Hemet, CA 92545

5381295, Jan 10, 1995

Jul 14, 1992

7/912800

Larry Rund - Idyllwild CA
Richard P. Hewitt - Romoland CA
Stuart Sigafoos - Perris CA

Datamax Electronics, Inc. - Romoland CA

H02H 700
B60L 100

361 92

A battery drain limitation circuit, for use in engine-powered vehicles and equipment that rely on a battery for starting the engine and for operating accessories, disconnects the battery from all loads when the battery voltage falls to a level below which the battery charge may be insufficient to start the engine. The circuit is rendered inoperable, when the engine is running, by means of a microphone that detects engine noise. The circuit includes a reset mechanism that reconnects the battery to all loads. The reset mechanism may be automatic or manually actuated. A timing circuit delays the disconnection for a period of time sufficient to start the engine. The drain limitation circuit employs a latching relay that, in its preferred embodiment, includes front and rear coils in tandem, axially separated by a collar with an internal detent. A front plunger and a rear plunger are disposed for axial movement within the coils and the collar. The front plunger is provided with a contact actuation arm, and with latching elements that engage the detent when the plungers move in a first direction in response to the energization of the front coil, thereby latching the actuation arm in a position in which it closes the relay's contacts.

6243940, Jun 12, 2001

May 11, 1999

9/310025

Larry D. Rund - Idyllwild CA
Richard P. Hewitt - Ramoland CA
Stuart O. Sigafoos - Hemet CA

H01F 4102

29608

A method of gapping a ferrite core by coating the core with a stabilizing material, fracturing the core with a laser beam thereby creating one or more gaps in the core's magnetic field, optionally opening the fracture to obtain a desire inductance, and then sealing the core.

6066899, May 23, 2000

Jul 30, 1997

8/902930

Larry D. Rund - Idyllwild CA
Richard P. Hewitt - Ramoland CA
Stuart O. Sigafoos - Perris CA

Power Technics, Inc. - Ramoland CA

H02H 718

307 107

A battery drain limitation circuit for use in engine powered vehicles and equipment which rely upon a battery to start the engine and also to operate accessories. When the engine is not running, the circuit disconnects the battery from all loads when battery charge, as measured by either one of two complementary means responsive to high and low drain rates, respectively, falls to a level below which the battery charge may not be sufficient to start the engine. High drain rates exaggerate battery voltage reduction below no load voltage levels, and are detected by a low cutoff voltage level after which the battery voltage recovers to reflect sufficient charge to start the engine. Battery dissipation from low drain rates is prevented by a long timing delay following detection of a high cutoff voltage level. The circuit is rendered inoperable if the engine is running, by means of a microphone which detects engine noise. The device is simple to install at the battery.