Patent US4970794A successfully refreshed from Google Patents.
US4970794A
Expired / Lapsed
US
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Prism and sighting target assembly
Assignee: Pyramid Optical Inc
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Filing: 1989-04-04
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Granted: 1990-11-20
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Expires: 2009-04-04
Abstract
Abstract An improved combination of prism assembly and sighting target in a novel structure in which the sighting target provides a dual function by acting as the structural support for the prism assembly in addition to its usual function of providing a readily observable target from long distances. More specifically, the present invention provides, in a preferred embodiment, a diamond shaped sighting target, the center of which is provided with an aperture for receiving the prism assembly housing which extends therethrough in a direction normal to the plane of the sighting target. The prism housing is secured to the sighting target by means of a bracket into which the prism assembly is threaded, the bracket being secured to the sighting target.
Inventors
- 👤 Galen L. Buckley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:42
CPC Classifications
G; G01; G01C; G01C15/00; G01C15/02; G01C15/06
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
106 words
A combined prism assembly and sighting target apparatus for use in conjunction with instrumentation for measuring distances in surveying and the like; the apparatus comprising: a sighting target having targeting indicia defining a center point and having an aperture through said center point for receiving a prism housing therethrough, said target also having means for connection to a tripod; a prism housing having a reflecting prism and extending through said target aperture; means for securing said prism housing to said sighting target; and wherein said visible surface area of said sighting target is at least twenty times larger than the reflecting surface area of said prism.
Claim 2
Dependent Claim
106 words
A combined prism assembly and sighting target apparatus for use in conjunction with instrumentation for measuring distances in surveying and the like; the apparatus comprising: a sighting target having targeting indicia defining a center point and having an aperture through said center point for receiving a prism housing therethrough, said target also having means for connection to a tripod; a prism housing having a reflecting prism and extending through said target aperture; means for securing said prism housing to said sighting target; and wherein said visible surface area of said sighting target is at least twenty times larger than the reflecting surface area of said prism.
Claim 3
Dependent Claim
48 words
The apparatus recited in claim 1 wherein said prism housing comprises a threaded portion and wherein said securing means comprises a bracket having a mating threaded aperture for receiving said threaded portion of said housing and at least one fastening device for fastening said bracket to said target.
Claim 4
Dependent Claim
68 words
A combined prism assembly and sighting targe apparatus for use in surveying and the like; the apparatus comprising: a sighting target having means for attachment to a tripod; a prism housing having a retro-reflective prism; means securing the prism housing to the sighting target; and wherein the visible surface area of said sighting target is at least twenty times larger than the reflecting surface area of said prism.
Claim 5
Dependent Claim
68 words
A combined prism assembly and sighting targe apparatus for use in surveying and the like; the apparatus comprising: a sighting target having means for attachment to a tripod; a prism housing having a retro-reflective prism; means securing the prism housing to the sighting target; and wherein the visible surface area of said sighting target is at least twenty times larger than the reflecting surface area of said prism.
Claim 6
Dependent Claim
34 words
The apparatus recited in claim 3 wherein said securing means comprises an aperture in said sighting target and a bracket receiving said prism housing through said aperture, said bracket being affixed to said target.
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) | 1993-11-19 | 1994-05-21 | 1994-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-11-19 | 1998-05-21 | 1998-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-11-19 | 2002-05-21 | 2002-11-20 | $7700.00 | Window Closed / Lapsed |