Patent US3748026A successfully refreshed from Google Patents.
US3748026A
Expired / Lapsed
US
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Reflector for distance measurement
Assignee: Linde Sverige AB
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Filing: 1971-08-23
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Granted: 1973-07-24
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Expires: 1991-08-23
Abstract
Abstract A light reflector having a corner prism mounted for pivotal movement about at least one axis intersecting the optical axis of the prism between the vertex and the base surface. The distance between the pivotal axis and the base surface is chosen in accordance with a special relationship for minimizing measurement errors due to misalignment of the prism with respect to incident light beams.
Inventors
- 👤 R Scholdstrom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:02
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/12; G02B5/122
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
116 words
A reflector for use in distance measurements by means of electromagnetic waves, comprising a corner prism having a base surface and mutually perpendicular reflecting surfaces intersecting each other in a vertex and making equal angles with the base surface, and means for providing rotation of said corner prism about at least one axis intersecting the axis of symmetry of the prism at a point intermediate the base surface and the vertex, the distance between the point and the base surface being approximately equal to L/n, where L is the distance, as measured along the axis of symmetry, between the vertex and the base surface, and n is the refractive index of the material of the prism.
Claim 2
Dependent Claim
116 words
A reflector for use in distance measurements by means of electromagnetic waves, comprising a corner prism having a base surface and mutually perpendicular reflecting surfaces intersecting each other in a vertex and making equal angles with the base surface, and means for providing rotation of said corner prism about at least one axis intersecting the axis of symmetry of the prism at a point intermediate the base surface and the vertex, the distance between the point and the base surface being approximately equal to L/n, where L is the distance, as measured along the axis of symmetry, between the vertex and the base surface, and n is the refractive index of the material of the prism.
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) | 1976-07-23 | 1977-01-22 | 1977-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-23 | 1981-01-22 | 1981-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-23 | 1985-01-22 | 1985-07-24 | $7700.00 | Window Closed / Lapsed |