LexDanaLexDanabeta
Inventor

David R. Guard

Inventor
Ipswich, GB

Overview

3→
Patents
1980–1984
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.

H04Mprimary
H04MTelephonic communication75%
H04RLoudspeakers, microphones, gramophone pick-ups or like acoustic electromechanical transducers25%
PatentTitleYear
4,456,789'Audio teleconferencing'19844,268,716'Audio teleconferencing'19814,237,339'Audio teleconferencing'1980

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1980–1984Patents assigned to POST OFFICE (3)· patent assignee history
1980–1984Based in Ipswich, GB· patent location history

Inventor activity

Assignee and location history derived from the patent record.

Assignees
AssigneePatentsSpan
POST OFFICE31980–1984
Locations
LocationPatentsSpan
Ipswich, GB31980–1984