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The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Patent No.:

US 5225235 B1

PDFFull Text
Date of Patent:
Jul. 06, 1993

Filed:

Aug. 05, 1991

Semiconductor wafer and manufacturing method therefor

Applicant:
Inventors:

Tetsujiro Yoshiharu, Amagasaki, JP;

Haruo Kamise, Kishima, JP;

Assignees:

Osaka Titanium Co., Ltd., Amagasaki, JP;

Kyushu Electronic Metal Co., Ltd., Saga, JP;

Attorney:

Burns, Doane, Swecker & Mathis

Primary Examiner:

Ellis P Robinson

Assistant Examiner:

Nasser Ahmad

Int. Cl.
CPC ...
B32B / ;
U.S. Cl.
CPC ...
428 64 ; 428 66 ; 428192 ; 428212 ; 428216 ; 428446 ; 428698 ; 428699 ; 428704 ; 148 333 ; 148D / ; 437 95 ; 437238 ; 437946 ; 437947 ;
Abstract

A semiconductor wafer on which silicon or the like is epitaxially grown and p-type or n-type impurities are doped and which has at the rear surface except for the peripheral edge portion thereof a blocking film for preventing jumping out of impurities therefrom which causes auto-doping, thereby preventing silicon particles from being produced at the peripheral surface and preventing the semiconductor wafer from being contaminated by the silicon particles during the manufacturing a semiconductor device.

Find Patent Forward Citations

Yoshiharu, Tetsujiro. (1993). Semiconductor wafer and manufacturing method therefor (U.S. Patent No. 5225235). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/5225235

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

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