Inventor

James H. K. Tsang

Inventor

Guangdong, CN

Overview

2→

Patents

1992–2021

Patent span

Mechanical engineering

Primary field (CPC F)

Patents· 2 as inventor

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

C09Kprimary

C09KMaterials for miscellaneous applications, not provided for elsewhere20%

F21KNon-electric light sources using luminescence20%

F21VFunctional features or details of lighting devices or systems thereof20%

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 emitted20%

H10HInorganic light-emitting semiconductor devices having potential barriers20%

PatentTitleYear

10,920,135Preparation method of an LED illuminating device2021 D0328358'Adjustable table lamp'1992

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1992Patents assigned to DODWELL HONG KONG BUYING OFFICE LTD (1)· patent assignee history

1992Based in Kowloon, HK· patent location history

2021Patents assigned to SHENZHEN YMH INTELLIGENT TECH CO LTD (1)· patent assignee history

2021Based in Guangdong, CN· patent location history

Inventor activity

Assignee and location history derived from the patent record.

Assignees

Assignee	Patents	Span
DODWELL HONG KONG BUYING OFFICE LTD	1	1992
SHENZHEN YMH INTELLIGENT TECH CO LTD	1	2021

Locations

Location	Patents	Span
Guangdong, CN	1	2021
Kowloon, HK	1	1992