US3563665A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical system for examining surface profiles of objects by the optical intersection method
Assignee: Nikon Corp
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Filing: 1968-05-13
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Granted: 1971-02-16
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Expires: 1988-05-13
Abstract
Abstract AN OPTICAL SYSTEM IS PROVIDED FOR EXAMINING AND PHOTOGRAPHING SURFACE PROFILES OF SPECIMENS BY THE OPTICAL INTERSECTION METHOD. A SLIT ELEMENT IS PROVIDED FOR PROJECTING LIGHT RAYS ONTO THE SURFACE OF THE SPECIMEN TO BE EXAMINED BY A MIRROR OR PRISM ON THE OPTICAL AXIS OF AN OBJECTIVE LENS, THROUGH THE OBJECTIVE LENS AND THROUGH A DOUBLE PENTAPRISM ARRANGEMENT ONTO THE SPECIMEN SURFACE. THE SPECIMEN REFLECTED LIGHT RAYS AGAIN PASS THROUGH THE DOUBLE PRISM ARRANGEMENT AND THE OBJECTIVE LENS TO AN CYEPIECE OR THE OBJECTIVE LENS OF A CAMERA. THE ARRANGEMENT IS SUCH THAT THE DOUBLE PENTAPRISM OR THE SLIT ELEMENT IS MOVABLE TRANSVERSELY RELATIVE TO THE OPTICAL AXIS.
Inventors
- 👤 Kinji Takahashi
- 👤 Jinichi Kato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:30
CPC Classifications
G; G01; G01B; G01B11/00; G01B11/24; G01B11/25; G01B11/2518
Claims Analysis
Total Claims: 0
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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) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |