Inventor

Douglas A. Spencer

Inventor

Boulder, CO, US

Overview

1983–2013

Patent span

Electricity

Primary field (CPC H)

Patents· 17 as inventor

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

H04Qprimary

H04QSelecting22%

H04JMultiplex communication16%

H04WWireless communication networks16%

H04MTelephonic communication13%

H04LTransmission of digital information, e.g. telegraphic communication6%

E21BEarth or rock drilling3%

F01DNon-positive displacement machines or engines, e.g. steam turbines3%

F02CGas-turbine plants3%

F16CShafts3%

F16NLubricating3%

PatentTitleYear

8,596,417'Lubrication systems with nozzle blockage detection systems'2013 8,342,796'Damping systems for use in engines'2013 8,035,374'Pipe stress detection tool using magnetic barkhausen noise'2011 7,180,869'Comprehensive echo control system'2007 6,674,853'Integration of remote access and service'2004 5,982,783'Switch distribution via an intermediary switching network'1999 5,862,131'Hybrid time-slot and sub-time-slot operation in a time-division multiplexed system'1999 5,521,903'Port system for interfacing digital PBX to digital transmission facility'1996 5,305,308'Wireless access telephone-to-telephone network interface architecture'1994 5,278,892'Mobile telephone system call processing arrangement'1994 5,195,090'Wireless access telephone-to-telephone network interface architecture'1993 5,195,091'Adaptive synchronization arrangement'1993 5,184,347'Adaptive synchronization arrangement'1993 4,894,822'Fast packetized data delivery for digital networks'1990 4,510,596'Time slot assignment facilities'1985 4,488,294'Establishing and supporting data traffic in private branch exchanges'1984 4,398,287'Digital switching over PAM bus system'1983

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1983–2007Based in Boulder, CO, US· patent location history

1984–1994Patents assigned to AT & T BELL LAB (7)· patent assignee history

1999Patents assigned to LUCENT TECHNOLOGIES INC (2)· patent assignee history

2004–2007Patents assigned to AVAYA TECHNOLOGY CORP (2)· patent assignee history

2011Based in Williamsburg, MI, US· patent location history

2013Patents assigned to HONEYWELL INT INC (2)· patent assignee history

2013Patents assigned to SPENCER DOUGLAS (2)· patent assignee history

2013Based in Mesa, AZ, US· patent location history

Inventor activity

Assignee and location history derived from the patent record.

Assignees

Assignee	Patents	Span
AT & T BELL LAB	7	1984–1994
AVAYA TECHNOLOGY CORP	2	2004–2007
HONEYWELL INT INC	2	2013
LUCENT TECHNOLOGIES INC	2	1999
SPENCER DOUGLASself	2	2013

Locations

Location	Patents	Span
Boulder, CO, US	14	1983–2007
Mesa, AZ, US	2	2013
Williamsburg, MI, US	1	2011