Inventor

Douglas A. Johns

Inventor

West Palm Beach, FL, US

Overview

1976–1996

Patent span

Electricity

Primary field (CPC H)

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

G01Fprimary

G01FMeasuring volume, volume flow, mass flow or liquid level25%

H05BElectric heating25%

H02JElectric power networks13%

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 systems13%

Y02BClimate change mitigation technologies related to buildings, e.g. housing, house appliances or related end-user applications13%

Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests13%

PatentTitleYear

Assembled from patent assignee/location history and declaration credentials.

1976Patents assigned to SCIENT INSTR INC (1)· patent assignee history

1976Based in Lantana, FL, US· patent location history

1977Patents assigned to AIRCO INC (1)· patent assignee history

1977Based in Eden, NY, US· patent location history

1991–1992Patents assigned to INTENT PATENT AG (2)· patent assignee history

1991–1992Based in West Palm Beach, FL, US· patent location history

1996Patents assigned to YORK TECHNOLOGIES INC (1)· patent assignee history

1996Based in Atlantis, FL, US· patent location history

Assignee and location history derived from the patent record.

Assignees

Locations