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Inventor

Dolf Landheer

Inventor
Toronto, CA

Overview

8→
Patents
1981–2004
Patent span
Physics
Primary field (CPC G)

Patents· 8 as inventor

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

G03Gprimary
G03GElectrography45%
B41JTypewriters27%
H01TSpark gaps9%
H10DInorganic electric semiconductor devices9%
H10PGeneric processes or apparatus for the manufacture or treatment of devices covered by class h109%
PatentTitleYear
6,700,171'Gate dielectric'20044,745,421'Ionic print cartridge and printer'19884,679,060'Ionic print cartridge and printer'19874,619,515'Electrostatic printing apparatus and method'19864,595,277'Toner supply control system'19864,516,847'Electrostatic printing apparatus and method'19854,514,781'Corona device'19854,254,424'Electrostatic recording apparatus'1981

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1981–1986Based in Toronto, CA· patent location history
1985–1988Patents assigned to DELPHAX SYSTEMS (3)· patent assignee history
1985–1987Patents assigned to LANDHEER DOLF (3)· patent assignee history
1985–1987Patents assigned to PLASSCHAERT PAUL E (2)· patent assignee history
1985Patents assigned to COBB HAROLD W (1)· patent assignee history
1986Based in Ontario, CA· patent location history
1987–2004Based in Ottawa, CA· patent location history
2004Patents assigned to CA NAT RESEARCH COUNCIL (1)· patent assignee history

Inventor activity

Assignee and location history derived from the patent record.

Assignees
AssigneePatentsSpan
DELPHAX SYSTEMS31985–1988
LANDHEER DOLFself31985–1987
PLASSCHAERT PAUL E21985–1987
CA NAT RESEARCH COUNCIL12004
COBB HAROLD W11985
Locations
LocationPatentsSpan
Toronto, CA41981–1986
Ottawa, CA31987–2004
Ontario, CA11986