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Inventor

David A. Butterfield

Inventor
Broomfield, CO, US

Overview

7→
Patents
1988–2011
Patent span
Physics
Primary field (CPC G)

Patents· 7 as inventor

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

G06Fprimary
G06FElectric digital data processing57%
F01NGas-flow silencers or exhaust apparatus for machines or engines in general14%
H04LTransmission of digital information, e.g. telegraphic communication14%
LOC1214%
PatentTitleYear
7,925,872'Method and apparatus for using a directory service to facilitate centralized device naming'20117,203,774'Bus specific device enumeration system and method'20076,942,061'Muffler for internal combustion engine'2005D0492634'Bidirectional muffler'20046,687,767'Efficient direct memory access transfer of data and check information to and from a data storage device'20044,747,040'Dual operating system computer'19884,744,048'Display context switching arrangement'1988

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1988Patents assigned to AMERICAN TELEPHONE & TELEGRAPH (2)· patent assignee history
1988Patents assigned to AT & T INFORMATION SYSTEMS INC (2)· patent assignee history
1988Patents assigned to LOCUS COMPUTING CORP (2)· patent assignee history
1988Based in Sylmar, CA, US· patent location history
2004–2007Patents assigned to SUN MICROSYSTEMS INC (2)· patent assignee history
2004Patents assigned to JONES EXHAUST SYSTEMS (1)· patent assignee history
2004–2011Based in Broomfield, CO, US· patent location history
2004–2005Based in Mountain Home, AK, US· patent location history

Inventor activity

Assignee and location history derived from the patent record.

Assignees
AssigneePatentsSpan
AMERICAN TELEPHONE & TELEGRAPH21988
AT & T INFORMATION SYSTEMS INC21988
LOCUS COMPUTING CORP21988
SUN MICROSYSTEMS INC22004–2007
JONES EXHAUST SYSTEMS12004
Locations
LocationPatentsSpan
Broomfield, CO, US32004–2011
Mountain Home, AK, US22004–2005
Sylmar, California, US21988