logo

For the Inventor, By the Inventor

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 4745080 B1

PDFFull Text
Date of Patent:
May. 17, 1988

Filed:

Feb. 20, 1986

Method of making a self-aligned bipolar transistor with composite masking

Applicant:
Inventors:

Peter D Scovell, Chelmsford, GB;

Peter F Blomley, Bishops Stortford, GB;

Roger L Baker, Chelmsford, GB;

Gary J Tomkins, Maidstone, GB;

Assignee:

STC, plc, , GB;

Attorney:

Kerkam, Stowell, Kondracki & Clarke

Primary Examiner:

Brian E Hearn

Assistant Examiner:

William Bunch

Int. Cl.
CPC ...
B01J / ; H01L / ; H01L / ;
U.S. Cl.
CPC ...
437 31 ; 437 50 ; 437147 ; 437158 ; 437979 ; 437984 ; 437962 ; 437924 ; 357 34 ; 3575 / ; 357 / ; 357 59 ; 148102 ; 148106 ; 148116 ; 148124 ;
Abstract

A fully self-aligned polycrystalline silicon emitter bipolar transistor. Self-alignment of the p.sup.+ base contact (12) is achieved by using oxidized sidewalls (8) (sidewall spacers) of the emitter mesa (7) as part of the p.sup.+ base contact implantation mask. Collector contact (13) alignment can be achieved using oxidized sidewalls (17) of polycrystalline silicon alignment mesas (14) defined in the same polysilicon as the emitter mesa (7) but deposited on oxide (2) rather than the implanted base region (5).

Find Patent Forward Citations

Scovell, Peter. (1988). Method of making a self-aligned bipolar transistor with composite masking (U.S. Patent No. 4745080). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/4745080

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

Loading…