Inventor
Witawat Wijaranakula
Inventor
Vancouver, WA, US
Overview
Patents· 9 as inventor
Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.
C30Bprimary
C30BSingle-crystal growth28%
H10PGeneric processes or apparatus for the manufacture or treatment of devices covered by class h1022%
Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests17%
G01BMeasuring length, thickness or similar linear dimensions11%
Y10TTechnical subjects covered by former us classification11%
H10DInorganic electric semiconductor devices6%
LOC236%
PatentTitleYear
6,569,749'Silicon and oxygen ion co-implanation for metallic gettering in epitaxial wafers'20036,022,793'Silicon and oxygen ion co-implantation for metallic gettering in epitaxial wafers'20005,961,713'Method for manufacturing a wafer having a microdefect-free layer of a precisely predetermined depth'19995,865,887'Method for improving mechanical strength of the neck section of czochralski silicon crystal'19995,827,367'Apparatus for improving mechanical strength of the neck section of czochralski silicon crystal'1998D0394703'Pair of ball shaped odor absorbing material containers attached together with a flexible string'19985,629,216'Method for producing semiconductor wafers with low light scattering anomalies'19975,611,855'Method for manufacturing a calibration wafer having a microdefect-free layer of a precisely predetermined depth'19975,306,939'Epitaxial silicon wafers for CMOS integrated circuits'1994Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1994–1998Patents assigned to SEH AMERICA (2)· patent assignee history
1994–2003Based in Vancouver, WA, US· patent location history
1997–2003Patents assigned to SEH AMERICA INC (6)· patent assignee history
1998Patents assigned to INFOTIX SYSTEMS INC (1)· patent assignee history
1998Based in Clark, WA, US· patent location history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| SEH AMERICA INC | 6 | 1997–2003 |
| SEH AMERICA | 2 | 1994–1998 |
| INFOTIX SYSTEMS INC | 1 | 1998 |
Locations
| Location | Patents | Span |
|---|---|---|
| Vancouver, Washington, US | 8 | 1994–2003 |
| Clark, Washington, US | 1 | 1998 |