Inventor

Hao-Jan Chang

Inventor

San Jose, CA, US

Overview

1981–2017

Patent span

Physics

Primary field (CPC G)

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

G11Bprimary

G11BInformation storage based on relative movement between record carrier and transducer16%

B41JTypewriters11%

G03FPhotomechanical production of textured or patterned surfaces, e.g. for printing, for processing of semiconductor devices11%

G06FElectric digital data processing11%

G06KGraphical data reading11%

H04NPictorial communication, e.g. television11%

B41CProcesses for the manufacture or reproduction of printing surfaces5%

C08FMacromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds5%

G01NInvestigating or analysing materials by determining their chemical or physical properties5%

G03CPhotosensitive materials for photographic purposes5%

PatentTitleYear

Assembled from patent assignee/location history and declaration credentials.

1981–1984Patents assigned to EASTMAN KODAK CO (2)· patent assignee history

1981–1984Based in Santa Clara, CA, US· patent location history

1984Patents assigned to AMPEX (1)· patent assignee history

2000–2017Based in San Jose, CA, US· patent location history

2013–2015Patents assigned to DU PONT (2)· patent assignee history

2013Patents assigned to ARMSTRONG MARK L (1)· patent assignee history

2013–2015Based in Lansdale, PA, US· patent location history

2017Patents assigned to CHANG HAO-JAN (2)· patent assignee history

Assignee and location history derived from the patent record.

Assignees

Locations