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The ornamental design for a refractometer, as shown and described. |
FIG. 1 is a front elevational view of a refractometer showing my new design;
FIG. 2 is a rear elevational view thereof;
FIG. 3 is a top plan view thereof;
FIG. 4 is a bottom plan view thereof;
FIG. 5 is a left side elevational view thereof;
FIG. 6 is a right side elevational view thereof;
FIG. 7 is a perspective view thereof in use position.
Patent | Priority | Assignee | Title |
D327024, | Dec 29 1989 | Essilor International (Compagnie Generale d'Optique) | Refractometer |
D330769, | Oct 25 1989 | Carl-Zeiss-Stiftung, Heidenheim-Brenz | Confocal laser-scanning ophthalmoscope |
D341541, | Oct 23 1991 | Canon Kabushiki Kaisha | Automatic eye-refraction measuring apparatus with spectacle lens measuring apparatus |
D394505, | Jul 09 1996 | Canon Kabushiki Kaisha | Non-contact eye-pressure measuring apparatus |
D457962, | Nov 08 2001 | REICHERT, INC | Automatic refractometer |
D465850, | May 08 2001 | Canon Kabushiki Kaisha | Refractometer |
D552736, | May 02 2006 | Kabushiki Kaisha Topcon | Ophthalmic instrument |
D589622, | Nov 07 2007 | Oculus Optikgeraete GmbH | Autorefractokeratometer with integrated pachymeter |
D698444, | Aug 09 2011 | I-Optics | Scanning laser opthalmoscope |
D705430, | Mar 24 2011 | Canon Kabushiki Kaisha | Corneal tomography apparatus |
Patent | Priority | Assignee | Title |
D244483, | Apr 04 1975 | Nerthus, Inc. | Optical refraction testing instrument |
D253909, | Jul 08 1977 | CAMBRIDGE INSTRUMENTS INC , A DE CORP | Refractometer |
D285485, | Nov 25 1983 | CAMBRIDGE INSTRUMENTS INC , A DE CORP | Refractometer |
D296004, | Nov 21 1985 | CAMBRIDGE INSTRUMENTS INC , A DE CORP | Refractometer |
Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
Jul 28 1988 | NISHIMURA, HIROSHI | CANON KABUSHIKI KAISHA, A CORP OF JAPAN | ASSIGNMENT OF ASSIGNORS INTEREST | 004915 | /0790 | |
Aug 09 1988 | Canon Kabushiki Kaisha | (assignment on the face of the patent) | / |
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