Alexandra S. Frei

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8405 Winterthur, CH

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Patents Grantslast 30 patents

Information Patent Grant
Method and device for producing turbulences and the distribution th...
- Patent number 7,117,878
- Issue date Oct 10, 2006
- Lindenport S.A.
- Alexandra Sarah Frei
- B08 - CLEANING
Information Patent Grant
Current creating device and method for liquefaction of thickened cr...
- Patent number 6,217,207
- Issue date Apr 17, 2001
- Lindenport S.A.
- Bruno Streich
- B08 - CLEANING
Information Patent Grant
Method for avoiding sedimentation
- Patent number 5,830,283
- Issue date Nov 3, 1998
- Lindenport S.A.
- Alexandra S. Frei
- B08 - CLEANING
Information Patent Grant
Thin laminated microstructure with precisely aligned openings
- Patent number 5,698,299
- Issue date Dec 16, 1997
- Dyconex Patente AG
- Walter Schmidt
- B07 - SEPARATING SOLIDS FROM SOLIDS SORTING
Information Patent Grant
Apparatus for avoiding sedimentation
- Patent number 5,615,948
- Issue date Apr 1, 1997
- Alexandra S. Frei
- B08 - CLEANING
Information Patent Grant
Apparatus for preventing sedimentation
- Patent number 5,615,950
- Issue date Apr 1, 1997
- Alexandra S. Frei
- B08 - CLEANING
Information Patent Grant
Person identification system
- Patent number 5,418,525
- Issue date May 23, 1995
- Bauer Kaba AG
- Alexandra S. Frei
- G07 - CHECKING-DEVICES