US3345905A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for measuring phase differences in polarized light
Assignee: Compagnie de Saint Gobain SA
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Filing: 1961-12-26
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Granted: 1967-10-10
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Expires: 1981-12-26
Abstract
No abstract record available.
Inventors
- 👤 Acloque Paul Henri
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:26
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/21
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
137 words
IN AN OPTICAL INSTRUMENT FOR MEASURING PATH DIFFERENCES INTRODUCES IN POLARIZED LIGHT BY A SUBSTANTIALLY PLANAR SURFACED SPECIMEN, MEANS INCLUDING A PLANE POLARIZER OPERABLE TO PROJECT PLANE POLARIZED LIGHT INTO A SPECIMEN WITH ITS PLANE OF POLARIZATION INCLINED AT AN ANGLE TO THE PLANE OF THE SURFACE OF THE SPECIMEN, WHEREBY THE RESULTING LIGHT RAYS EMERGING FROM THE SPECIMEN ARE ELLIPTICALLY POLARIZED, A FRINGE COMPENSATOR, AN ANALYZER, AN OCULAR, MEANS MOUNTING SAID COMPENSATOR AND ANALYZER IN THE PATH OF SAID EMERGING LIGHT RAYS, TO BE TRAVERSED THEREBY IN THE ORDER MENTIONED, A QUARTER-WAVE PLATE POSITIONED IN THE PATH OF THE RAYS, BETWEEN SAID FRINGE COMPENSATOR AND SAID ANALYZER, THE TWO PRINCIPAL AXES OF SAID QUARTER-WAVE PLATE BEING, RESPECTIVELY, PARALLEL WITH AND AT 90* TO THE DIRECTION OF POLARIZATION OF SAID PLANE POLARIZER, SAID MOUNTING MEANS ENABLING ROTATION
Claim 2
Dependent Claim
137 words
IN AN OPTICAL INSTRUMENT FOR MEASURING PATH DIFFERENCES INTRODUCES IN POLARIZED LIGHT BY A SUBSTANTIALLY PLANAR SURFACED SPECIMEN, MEANS INCLUDING A PLANE POLARIZER OPERABLE TO PROJECT PLANE POLARIZED LIGHT INTO A SPECIMEN WITH ITS PLANE OF POLARIZATION INCLINED AT AN ANGLE TO THE PLANE OF THE SURFACE OF THE SPECIMEN, WHEREBY THE RESULTING LIGHT RAYS EMERGING FROM THE SPECIMEN ARE ELLIPTICALLY POLARIZED, A FRINGE COMPENSATOR, AN ANALYZER, AN OCULAR, MEANS MOUNTING SAID COMPENSATOR AND ANALYZER IN THE PATH OF SAID EMERGING LIGHT RAYS, TO BE TRAVERSED THEREBY IN THE ORDER MENTIONED, A QUARTER-WAVE PLATE POSITIONED IN THE PATH OF THE RAYS, BETWEEN SAID FRINGE COMPENSATOR AND SAID ANALYZER, THE TWO PRINCIPAL AXES OF SAID QUARTER-WAVE PLATE BEING, RESPECTIVELY, PARALLEL WITH AND AT 90* TO THE DIRECTION OF POLARIZATION OF SAID PLANE POLARIZER, SAID MOUNTING MEANS ENABLING ROTATION
References Cited (Backward Citations)
US2460515A
Cited
FR946695A
Cited
GB741557A
Cited
US2995060A
Cited
FR1138768A
Cited
US3060808A
Cited
US3096175A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-10-09 | 1971-04-10 | 1971-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-09 | 1975-04-10 | 1975-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-09 | 1979-04-10 | 1979-10-10 | $7700.00 | Window Closed / Lapsed |