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# (Old rule) 17 years from date of issue. May 25, 1993 + 17 years = May 25, 2010.
# (New rule) 20 years from date of filing. ([http://www.law.cornell.edu/uscode/35/154(a).html 35 U.S.C. § 154(a)]) But the date of filing includes, in some cases, priority dates based on international patent applications (see [http://www.patentlens.net/daisy/KeyOrgs/1236/418/420/422.html Patent Cooperation Treaty]).
Before Fgrieu's edits, the date of U.S. filing (1992-01-07) was used, but he rightly points out that an earlier date might actually apply. I'm just not sure which one....
One option for the priority date is the date of issue of the Swiss patent (1990-05-18), which would place the 20-year expiration on 2010-05-18, slightly before the "old rule" date.
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