Accessory for microscopes for use as a two-beam photometer
Abstract
Abstract AN ACCESSORY FOR MICROSCOPES COMPRISES A DIAPHRAGM AND A LIGHT SOURCE AT ONE SIDE THEREOF FOR ILLUMINATING THE SAME. A BEAM SPLITTER IS PROVIDED AT THE OTHER SIDE OF THE DIAPHRAGM FOR DIVIDING A LIGHT BEAM FROM THE MICROSCOPE EYEPIECE INTO A MEASURING LIGHT BEAM AND AN OBSERVATION LIGHT BEAM. MEANS ARE PROVIDED BETWEEN THE BEAM SPLITTER AND THE DIAPHRAGM FOR FORMING AN IMAGE OF THE DIAPHRAGM ALTENATELY VIA EACH OF TWO OPTICAL PATHS IN A PLANE CONJUGATE WITH THE DIAPHRAGM AND COINCIDENT WITH THE FOCAL PLANE FOR A LIGHT BEAM FROM THE MICROSCOPE EYEPIECE. WITH THE BEAM SPLITTER ARE OPTICAL MEANS ASSOCIATED FOR IMAGING THE DIAPHRAGM APERATURE IN THE FOCAL PLANE OF THE OBSERVATION LIGHT BEAM.
Inventors
- 👤 Karl Heinz Haas
Bibliographic Details
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-23 | 1975-11-22 | 1976-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-23 | 1979-11-22 | 1980-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-23 | 1983-11-22 | 1984-05-23 | $7700.00 | Window Closed / Lapsed |