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Inventor

David Duff

Inventor
Woodside, CA, US

Overview

3→
Patents
1983–2001
Patent span
Mechanical engineering
Primary field (CPC F)

Patents· 3 as inventor

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

A47Cprimary
A47CChairs17%
F21SNon-portable lighting devices17%
F21VFunctional features or details of lighting devices or systems thereof17%
F21WIndexing scheme associated with subclasses f21k, f21l, f21s and f21v, relating to uses or applications of lighting devices or systems17%
G01NInvestigating or analysing materials by determining their chemical or physical properties17%
G01RMeasuring electric variables17%
PatentTitleYear
6,203,173'Lighting assembly having above water and underwater operational capabilities'20015,705,928'Sample delivery system used in chemical analysis methods which employs pressurized gas for sample conveyance'19984,398,312'Sofa bed overdeck assembly'1983

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1983Patents assigned to HOOVER UNIVERSAL (1)· patent assignee history
1983Based in Ponca City, OK, US· patent location history
1998Patents assigned to VARIAN ASSOCIATES (1)· patent assignee history
1998Based in Ipswich, MA, US· patent location history
2001Patents assigned to WET ENTPR INC (1)· patent assignee history
2001Based in Woodside, CA, US· patent location history

Inventor activity

Assignee and location history derived from the patent record.

Assignees
AssigneePatentsSpan
HOOVER UNIVERSAL11983
VARIAN ASSOCIATES11998
WET ENTPR INC12001
Locations
LocationPatentsSpan
Woodside, California, US12001
Ipswich, Massachusetts, US11998
Ponca City, OK, US11983