Bullin Ultrasonics Inc.
4612 Carmden Road
Eaton, OH 45320

Phone 937-446-7133
Fax 937 - 456 - 2779

The standard for processing Pyrex is using Ultrasonics, the pattern
transfer is very true and the reproducibility is great.  I have tried to
etch Pyrex using HF but metals are usually degraded by the acid and
pin-holes eventually form.  I also know people mill glass with good
results but have no experience with that particular method.

Good Luck

Loren St. Clair
Staff Engineer
Electronic Visions Inc.

Tel:    (602)437-9492, ext. 121
Fax:    (602)437-9435
Email:  lstclair@elvisions.com
Web:    http://www.elvisions.com

        -----Original Message-----
        From:   Aizpurua, Mikel [SMTP:maizpurua@ceit.es]
        Sent:   Friday, April 24, 1998 8:11 AM
        To:     MEMS@ISI.EDU
        Subject:        Corning Micromachining


                Hi Everyone

                I am interested in finding out a way of how to
micromachine Corning
        7740.

                Thank you in advanced


                Mikel Aizpurua