Double refracting interference microscope
Abstract
Abstract IN AN INTERFERENCE MICROSCOPE OF THE KIND IN WHICH AN ILLUMINATING BEAM OF LIGHT IS DIVIDED INTO TWO BEAMS BY VIRTUE OF DOUBLE-REFRACTION OPTICALLY PRIOR TO INCIDENCE ON THE SPECIMENT AND IS RECOMBINED BY FURTHER, COMPENSATORY, DOUBLE REFRACTION OPTICALLY AFTER TRANSMISSION THROUGH THE OBJECTIVE LENS OF THE MICROSCOPE, VARIABLE DOUBLE-REFRACTING MEANS CONSISTING OF A SERIAL TRAIN OF BIREFRINGENT OPTICAL COMPONENTS ARE EMPLOYED FOR DIVIDING EACH RAY IN THE ILLUMINATING BEAM INTO TWO DOUBLE-REFRACTED RAYS HAVING A VARIABLE RELATIVE ANGULAR INCLINATION AND A LONGITUDINAL MOVABLE REAL OR VIRTUAL INTERSECTION POINT WHICH INCLINATION AND INTERSECTION POINT ARE PRE-SELECTABLE IN DIFFERENT COMBINATIONS BY ADJUSTMENT OF THE GEOMETRICAL RELATIONSHIP EXISTING BETWEEN THE COMPONENTS. IN THIS WAY AN INVARIANT GEOMETRICAL RELATIONSHIP BETWEEN THE DIVIDED RAYS EMERGING FROM THE OBJECTIVE MAY BE MAINTAINED THUS PERMITTING THE USE OF A RANGE OF DIFFERENT OBJECTIVE LENSES.
Inventors
- 👤 Francis Hughes Smith
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |