Referenced by|
| US3971621 | 27 Feb 1974 | 27 Jul 1976 | Ciba-Geigy Corporation | Method and apparatus for generating a relieflike contrast at microscopic images of a transparent phase object | | US5559630 | 17 Feb 1995 | 24 Sep 1996 | The Open University | Polarized light microscopy | | US5879286 | 13 Nov 1996 | 9 Mar 1999 | Welch Allyn, Inc. | Diagnostic instrument illumination system | | US5984493 | 14 Apr 1997 | 16 Nov 1999 | Lucent Technologies Inc. | Illumination system and method | | US6068593 | 4 Aug 1998 | 30 May 2000 | Welch Allyn, Inc. | Diagnostic instrument illumination system | | US7344273 | 22 Mar 2005 | 18 Mar 2008 | Binary Works, Inc. | Ring light with user manipulable control |
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