Inventor

Charles Jeffrey Spencer

Inventor

Wilmette, IL, US

Overview

6→

Patents

1997–2021

Patent span

Mechanical engineering

Primary field (CPC F)

Patents· 6 as inventor

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

F21Sprimary

F21SNon-portable lighting devices13%

F21VFunctional features or details of lighting devices or systems thereof13%

F21YIndexing scheme associated with subclasses f21k, f21l, f21s and f21v, relating to the form or the kind of the light sources or of the colour of the light emitted13%

H05BElectric heating13%

F16MFrames, casings or beds of engines, machines or apparatus, not specific to engines, machines or apparatus provided for elsewhere7%

G02BOptical elements, systems or apparatus7%

G09GArrangements or circuits for control of indicating devices using static means to present variable information7%

H01HElectric switches7%

H01RElectrically-conductive connections7%

H04RLoudspeakers, microphones, gramophone pick-ups or like acoustic electromechanical transducers7%

PatentTitleYear

11,118,779Luminaire with an integrated speaker2021 10,670,227Hyperbolic ceiling-reflector for directional light sources2020 10,104,731Combination dimmable driver2018 9,119,269'Lumen depreciation management'2015 5,686,708'Protective fuse shield for disconnect switches'1997 5,670,763'Dead front interlocked receptacle'1997

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1997Patents assigned to APPLETON ELECTRIC CO (2)· patent assignee history

1997Based in Chicago, IL, US· patent location history

2015Patents assigned to JUNO MFG LLC (1)· patent assignee history

2015Patents assigned to LEE MARTIN (1)· patent assignee history

2015Patents assigned to SERRA JOHN G (1)· patent assignee history

2015–2021Based in Wilmette, IL, US· patent location history

2018–2021Patents assigned to ABL IP HOLDING LLC (3)· patent assignee history

Inventor activity

Assignee and location history derived from the patent record.

Assignees

Assignee	Patents	Span
ABL IP HOLDING LLC	3	2018–2021
APPLETON ELECTRIC CO	2	1997
JUNO MFG LLC	1	2015
LEE MARTIN	1	2015
SERRA JOHN G	1	2015

Locations

Location	Patents	Span
Wilmette, Illinois, US	4	2015–2021
Chicago, Illinois, US	2	1997