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Inventor

Donald E. Hatfield

Inventor
Mattoon, IL, US

Overview

3→
Patents
2000–2021
Patent span
Electricity
Primary field (CPC H)

Patents· 3 as inventor

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

H01Jprimary
H01JElectric discharge tubes or discharge lamps40%
H01KElectric incandescent lamps40%
H04RLoudspeakers, microphones, gramophone pick-ups or like acoustic electromechanical transducers20%
PatentTitleYear
11,012,770Eartips for in-ear listening devices20216,203,392'Single ended quartz projection lamp'20016,011,353'Design and cooling of single ended quartz projection lamps'2000

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

2000–2001Patents assigned to GEN ELECTRIC (2)· patent assignee history
2000–2001Based in Mattoon, IL, US· patent location history
2021Patents assigned to APPLE INC (1)· patent assignee history
2021Based in Los Gatos, CA, US· patent location history

Inventor activity

Assignee and location history derived from the patent record.

Assignees
AssigneePatentsSpan
GEN ELECTRIC22000–2001
APPLE INC12021
Locations
LocationPatentsSpan
Mattoon, Illinois, US22000–2001
Los Gatos, California, US12021