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Inventor

John F. Prendergast, Sr.

Inventor
Franklin, WI, US

Overview

10→
Patents
1980–2015
Patent span
Performing operations
Primary field (CPC B)

Patents· 10 as inventor

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

B66Bprimary
B66BElevators31%
A61BDiagnosis15%
G05FSystems for regulating electric or magnetic variables15%
F21SNon-portable lighting devices8%
F24BDomestic stoves or ranges for solid fuels8%
F24CDomestic stoves or ranges8%
G01TMeasurement of nuclear or x-radiation8%
Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests8%
PatentTitleYear
9,134,032'Artificial fireplace'20156,459,265'Method and apparatus for reducing input impedance of a preamplifier'20026,369,550'Method and apparatus for reducing input impedance of a preamplifier'20025,168,131'Apparatus and method for controlling an elevator'1992D0322362'Stairway lift chair'19915,052,521'Stairway wheelchair lift'19914,913,264'Stairway chairlift mechanism'19904,904,916'Electrical control system for stairway wheelchair lift'19904,602,378'X-ray table'19864,223,222'Suspended arm for a scintillation camera'1980

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1980–2002Patents assigned to GEN ELECTRIC (4)· patent assignee history
1980–2002Based in Franklin, WI, US· patent location history
1990–1992Patents assigned to CHENEY COMPANY (4)· patent assignee history
1991Patents assigned to THE CHENEY COMPANY (1)· patent assignee history
2015Patents assigned to BASIC HOLDINGS (1)· patent assignee history
2015Based in Clogherhead, IE· patent location history

Inventor activity

Assignee and location history derived from the patent record.

Assignees
AssigneePatentsSpan
CHENEY COMPANY41990–1992
GEN ELECTRIC41980–2002
BASIC HOLDINGS12015
THE CHENEY COMPANY11991
Locations
LocationPatentsSpan
Franklin, WI, US91980–2002
Clogherhead, IE12015