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Inventor

Ralph Walk

Inventor
Madison, NJ, US

Overview

3→
Patents
1977–1989
Patent span
Electricity
Primary field (CPC H)

Patents· 3 as inventor

Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.

H02Mprimary
H02MApparatus for conversion between ac and ac, between ac and dc, or between dc and dc, and for use with mains or similar power supply systems60%
H01FMagnets20%
Y02BClimate change mitigation technologies related to buildings, e.g. housing, house appliances or related end-user applications20%
PatentTitleYear
4,849,874'Single mag amp control system for regulating bipolar voltage output of a power converter'19894,814,962'Zero voltage switching half bridge resonant converter'19894,053,822'Subharmonic frequency generator'1977

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1977Patents assigned to BELL TELEPHONE LABOR INC (1)· patent assignee history
1977Based in Randolph, NJ, US· patent location history
1989Patents assigned to AMERICAN TELEPHONE & TELEGRAPH (2)· patent assignee history
1989Based in Madison, NJ, US· patent location history

Inventor activity

Assignee and location history derived from the patent record.

Assignees
AssigneePatentsSpan
AMERICAN TELEPHONE & TELEGRAPH21989
BELL TELEPHONE LABOR INC11977
Locations
LocationPatentsSpan
Madison, New Jersey, US21989
Randolph, New Jersey, US11977