US3402633A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Long path multiple beam interferometer
Assignee: AT&T Inc
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Filing: 1965-03-30
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Granted: 1968-09-24
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Expires: 1985-03-30
Abstract
No abstract record available.
Inventors
- 👤 Donald R Herriott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:10
CPC Classifications
G; G01; G01B; G01B9/00; G01B9/02; G01B9/02034; G01B9/02038
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
125 words
AN INTERFEROMETER COMPRISING TWO TRANSREFLECTIVE SPERICAL CONCAVE MIRRORS OF COMMON CURVATURE SPACED APART A DISTANCE SUBSTANTIALLY EQUAL TO THE SUM OF THEIR RADII OF CURVATURE, A LENS INTERNAL TO THE CAVITY FORMED BY SAID MIRRORS POSITIONED WITH RESPECT TO EACH MIRROR TO PERMIT THE LENS TO IMAGE THE SURFACE OF EACH MIRROR ONTO THE SURFACE OF THE OTHER MIRROR, ONE MIRROR BEING TILTED WITH RESPECT TO THE OTHER IN ORDER TO PRODUCE AN INTERFERENCE PATTERN WHEREBY THE MULTIPLE REFLECTIONS OF THE LIGHT RAYS PASS THROUGH DIFFERENT PARTS OF THE LENS AND ARE RESPECTIVELY IMAGED TO THE SAME POINTS ON THE TWO MIRRORS, AND ILLUMINATION MEANS EXTERNAL TO SAID CAVITY TO IRRADIATE ONE OF THE MIRROR SURFACES WITH MONOCHROMATIC LIGHT RAYS PERPENDICULAR TO ITS INNER SURFACE.
Claim 2
Dependent Claim
125 words
AN INTERFEROMETER COMPRISING TWO TRANSREFLECTIVE SPERICAL CONCAVE MIRRORS OF COMMON CURVATURE SPACED APART A DISTANCE SUBSTANTIALLY EQUAL TO THE SUM OF THEIR RADII OF CURVATURE, A LENS INTERNAL TO THE CAVITY FORMED BY SAID MIRRORS POSITIONED WITH RESPECT TO EACH MIRROR TO PERMIT THE LENS TO IMAGE THE SURFACE OF EACH MIRROR ONTO THE SURFACE OF THE OTHER MIRROR, ONE MIRROR BEING TILTED WITH RESPECT TO THE OTHER IN ORDER TO PRODUCE AN INTERFERENCE PATTERN WHEREBY THE MULTIPLE REFLECTIONS OF THE LIGHT RAYS PASS THROUGH DIFFERENT PARTS OF THE LENS AND ARE RESPECTIVELY IMAGED TO THE SAME POINTS ON THE TWO MIRRORS, AND ILLUMINATION MEANS EXTERNAL TO SAID CAVITY TO IRRADIATE ONE OF THE MIRROR SURFACES WITH MONOCHROMATIC LIGHT RAYS PERPENDICULAR TO ITS INNER SURFACE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-09-24 | 1972-03-25 | 1972-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-09-24 | 1976-03-25 | 1976-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-09-24 | 1980-03-25 | 1980-09-24 | $7700.00 | Window Closed / Lapsed |