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Michiel Groothuis
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Saint-Imier, CH
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last 30 patents
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Patent Grant
Watch having a glass retaining strap
Patent number
4,924,453
Issue date
May 8, 1990
Le Phare-Jean D'Eve S.A.
Claude Ray
G04 - HOROLOGY
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Patent Grant
Timepiece and method for its realization
Patent number
4,922,474
Issue date
May 1, 1990
Conseilray S.A.
Michiel Groothuis
G04 - HOROLOGY
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Patent Grant
Watch having a visible energy producing oscillatory mass
Patent number
4,910,720
Issue date
Mar 20, 1990
Le Phare-Jean D'Eve S.A.
Claude Ray
G04 - HOROLOGY
Information
Patent Grant
Chronograph watch
Patent number
4,748,603
Issue date
May 31, 1988
Conseilray S.A.
Claude Ray
G04 - HOROLOGY