Patent US2743645A successfully refreshed from Google Patents.
US2743645A
Expired / Lapsed
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Interferometric apparatus for examining the structure of reflecting surfaces
Assignee: CE Johansson AB
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Filing: 1952-08-20
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Granted: 1956-05-01
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Expires: 1972-08-20
Abstract
No abstract record available.
Inventors
- 👤 Larsson Lars Evald Holger
- 👤 Rydstrom Karl Erik Nicolaus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:09
CPC Classifications
G; G01; G01B; G01B9/00; G01B9/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
143 words
AN INTERFEROMETRIC APPARATUS FOR EXAMINING THE STRUCTURE OF REFLECTING SURFACES, COMPRISING A HOUSING, AN INTERFERENCE PLATE MADE OF A TRANSPARENT MATERIAL AND HAVING A REFLECTING AND PARTLY TRANSPARENT LAYER, AN OPENENDED BELLOWS MADE OF AN ELASTIC MATERIAL ATTACHED AT ONE END TO SAID HOUSING, A HOLDER FOR SAID INTERFERENCE PLATE ATTACHED TO THE OTHER END OF SAID BELLOWS FOR ALLOWING TILTING MOVEMENT OF SAID INTERFERENCE PLATE RELATIVELY TO SAID HOUSING AND THUS FOR SUPPORTING SAID PLATE IN SUCH ARBITRARY POSITION RELATIVELY TO THE REFLECTING SURFACE TO BE EXAMINED AS TO FORM AN INTERFERENCE SPACE BETWEEN THE REFLECTING AND PARTLY TRANSPARENT LAYER ON SAID INTERFERENCE PLATE AND THE REFLECTING SURFACE TO BE EXAMINED, AND MEANS FOR PROJECTING A BEAM OF LIGHT FROM SAID HOUSING INTO SAID INTERFERENCE SPACE, SAID BELLOW ENCLOSING THE PATH OF THE LIGHT BEAM BETWEEN SAID HOUSING AND SAID INTERFERENCE PLATE.
Claim 2
Dependent Claim
143 words
AN INTERFEROMETRIC APPARATUS FOR EXAMINING THE STRUCTURE OF REFLECTING SURFACES, COMPRISING A HOUSING, AN INTERFERENCE PLATE MADE OF A TRANSPARENT MATERIAL AND HAVING A REFLECTING AND PARTLY TRANSPARENT LAYER, AN OPENENDED BELLOWS MADE OF AN ELASTIC MATERIAL ATTACHED AT ONE END TO SAID HOUSING, A HOLDER FOR SAID INTERFERENCE PLATE ATTACHED TO THE OTHER END OF SAID BELLOWS FOR ALLOWING TILTING MOVEMENT OF SAID INTERFERENCE PLATE RELATIVELY TO SAID HOUSING AND THUS FOR SUPPORTING SAID PLATE IN SUCH ARBITRARY POSITION RELATIVELY TO THE REFLECTING SURFACE TO BE EXAMINED AS TO FORM AN INTERFERENCE SPACE BETWEEN THE REFLECTING AND PARTLY TRANSPARENT LAYER ON SAID INTERFERENCE PLATE AND THE REFLECTING SURFACE TO BE EXAMINED, AND MEANS FOR PROJECTING A BEAM OF LIGHT FROM SAID HOUSING INTO SAID INTERFERENCE SPACE, SAID BELLOW ENCLOSING THE PATH OF THE LIGHT BEAM BETWEEN SAID HOUSING AND SAID INTERFERENCE PLATE.
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) | 1959-05-01 | 1959-10-31 | 1960-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-05-01 | 1963-10-31 | 1964-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-05-01 | 1967-10-31 | 1968-05-01 | $7700.00 | Window Closed / Lapsed |