US3565568A
Expired / Lapsed
US
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Method and apparatus for ascertaining geometric deviations from an ideal surface by optical means
Assignee: Ernst Leitz Wetzlar GmbH
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Filing: 1967-11-02
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Granted: 1971-02-23
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Expires: 1987-11-02
Abstract
Abstract A METHOD AND APPARATUS FOR DETERMINING THE SIZE OF GEOMETRIC DEVIATIONS OF A REFLECTING SURFACE FROM AN IDEAL SURFACE COMPRISING: (A) EXPOSING THE REFLECTING SURFACE TO LIGHT RAYS OF DEFINITE SOLID ANGLE AND IMAGE AREA, (B) SEPARATING LIGHT REFLECTED FROM THE REFLECTING SURFACE TO A FIRST COMPONENT COMPRISING LIGHT REFLECTED REGULARLY FROM THE IDEAL SURFACE, AND A SECOND COMPONENT COMPRISING LIGHT IRREGULARLY REFLECTED AND (OR) SCATTERED FROM DEVIATIONS FROM THE IDEAL SURFACE, AND (C) DETERMINING THE RATIO OF DIFFERENCE BETWEEN THE FIRST COMPONENT AND THE SECOND COMPONENT AND RECORDING THE RATIO OR DIFFERENCE.
Inventors
- 👤 Fromund Hock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:37
CPC Classifications
G; G01; G01B; G01B11/00; G01B11/30; G01B11/303; G01J; G01J1/00; G01J1/10; G01J1/20; G01J1/34; G01J1/36; G01N; G01N21/00; G01N21/17; G01N21/47; G01N21/49; G01N21/53; G01N21/84; G01N21/88
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-22 | 1974-08-24 | 1975-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-22 | 1978-08-24 | 1979-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-22 | 1982-08-24 | 1983-02-23 | $7700.00 | Window Closed / Lapsed |