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Inventor

Michael R. Marr

Inventor
Chapel Hill, NC, US

Overview

4→
Patents
1987–1992
Patent span
Physics
Primary field (CPC G)

Patents· 4 as inventor

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

G06Fprimary
G06FElectric digital data processing60%
G01RMeasuring electric variables20%
H04MTelephonic communication20%
PatentTitleYear
5,121,420'Automatic line defect detector'19924,837,677'Multiple port service expansion adapter for a communications controller'19894,751,634'Multiple port communications adapter apparatus'19884,716,523'Multiple port integrated DMA and interrupt controller and arbitrator'1987

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1987–1989Patents assigned to IBM (3)· patent assignee history
1987–1989Based in Chapel Hill, NC, US· patent location history
1992Patents assigned to ROLM SYSTEMS (1)· patent assignee history
1992Based in Redwood City, CA, US· patent location history

Inventor activity

Assignee and location history derived from the patent record.

Assignees
AssigneePatentsSpan
IBM31987–1989
ROLM SYSTEMS11992
Locations
LocationPatentsSpan
Chapel Hill, NC, US31987–1989
Redwood City, California, US11992