US3218915A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for automatically maintaining parallelism between two optically flat surfaces
Assignee: Commonwealth Scientific and Industrial Research Organisation
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Filing: 1962-06-25
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Granted: 1965-11-23
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Expires: 1982-06-25
Abstract
No abstract record available.
Inventors
- 👤 Jack V Ramsay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:53
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/10; H01S3/13; H01S3/139; H01S3/1398; G; G01; G01B; G01B9/00; G01B9/02; G01B9/02055; G01B9/02062; G01B9/02067; G01B9/02068; G01B2290/00; G01B2290/25
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
156 words
APPARATUS FOR MAINTAINING PARALLELISM BETWEEN TWO PARTIALLY TRANSPARENT OPTICALLY FLAT SURFACES COMPRISING MEANS FOR CAUSING A BEAM OF LIGHT TO BE MULTIPLY REFLECTED BETWEEN THE TWO SURFACES AT ONE POSITION AND TO FINALLY PASS THROUGH AND EMERGE FROM ONE OF THE SURFACES TO FORM A FIRST EMERGENT TRANSMITTED BEAM, AN AUXILIARY OPTICAL SYSTEM WHICH CAUSES THE SAID FIRST EMERGENT BEAM TO BE MULTIPLY REFLECTED AGAIN BETWEEN THE TWO SURFACES AT A MINIMUM OF TWO OTHER POSITIONS DISPLACED FROM THE SAID ONE POSITION AND FROM EACH OTHER AND TO FINALLY PASS THROUGH AND EMERGE FROM THE OTHER SURFACE TO FORM FURTHER EMERGENT TRANSMITTED BEAMS, SO THAT THE SAID FIRST AND FURTHER EMERGENT TRANSMITTED BEAMS MAKE THE SAME ANGLE WITH THE NORMALS TO ONE SURFACE ON THEIR FORWARD AND RETURN PASSAGES, AND MEANS FOR AUTOMATICALLY ADJUSTING THE DISTANCE ALONG THE NORMALS AT THE SAID POSITIONS TO ENSURE MAXIMUM TRANSMISSION OF LIGHT IN EACH OF THE TRANSMITTED EMERGENT BEAMS.
Claim 2
Dependent Claim
156 words
APPARATUS FOR MAINTAINING PARALLELISM BETWEEN TWO PARTIALLY TRANSPARENT OPTICALLY FLAT SURFACES COMPRISING MEANS FOR CAUSING A BEAM OF LIGHT TO BE MULTIPLY REFLECTED BETWEEN THE TWO SURFACES AT ONE POSITION AND TO FINALLY PASS THROUGH AND EMERGE FROM ONE OF THE SURFACES TO FORM A FIRST EMERGENT TRANSMITTED BEAM, AN AUXILIARY OPTICAL SYSTEM WHICH CAUSES THE SAID FIRST EMERGENT BEAM TO BE MULTIPLY REFLECTED AGAIN BETWEEN THE TWO SURFACES AT A MINIMUM OF TWO OTHER POSITIONS DISPLACED FROM THE SAID ONE POSITION AND FROM EACH OTHER AND TO FINALLY PASS THROUGH AND EMERGE FROM THE OTHER SURFACE TO FORM FURTHER EMERGENT TRANSMITTED BEAMS, SO THAT THE SAID FIRST AND FURTHER EMERGENT TRANSMITTED BEAMS MAKE THE SAME ANGLE WITH THE NORMALS TO ONE SURFACE ON THEIR FORWARD AND RETURN PASSAGES, AND MEANS FOR AUTOMATICALLY ADJUSTING THE DISTANCE ALONG THE NORMALS AT THE SAID POSITIONS TO ENSURE MAXIMUM TRANSMISSION OF LIGHT IN EACH OF THE TRANSMITTED EMERGENT BEAMS.
References 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) | 1968-11-22 | 1969-05-24 | 1969-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-22 | 1973-05-24 | 1973-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-22 | 1977-05-24 | 1977-11-23 | $7700.00 | Window Closed / Lapsed |