Patent US1464897A successfully refreshed from Google Patents.
Patent US3565539A successfully refreshed from Google Patents.
US3565539A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Collimated sight
Assignee: Farrand Optical Co Inc
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Filing: 1967-06-12
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Granted: 1971-02-23
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Expires: 1987-06-12
Abstract
Abstract THERE IS DISCLOSED A SIGHT, FOR USE FOR EXAMPLE ON A FIREARM, WHICH EMPLOYS A PARTIALLY REFLECTING CONCAVE MIRROR TO PRESENT TO THE USER BY MEANS OF COLLIMATED LIGHT AN IMAGE AT INFINITY OF AN AIMING PATTERN SUCH AS A LUMINOUS DOT OR CIRCLE, SUPERIMPOSED ON THE FIELD OF VIEW AS SEEN UNALTERED THROUGH THE CONCAVE MIRROR. THE AIMING PATTERN IS DISPOSED ON THE FOCAL SURFACE OF THE CONCAVE MIRROR, AND IN ONE EMBODIMENT TAKEN THE FORM OF A MINIFIED IMAGE, REAL OR VIRTUAL, OF AN AIMING PATTERN ESTABLISHED ELSEWHERE. THE MINIFIED IMAGE IS GENERATED BY A CURVED REFLECTING SURFACE POSITIONED TO HAVE ITS FOCAL SURFACE ON THE FOCAL SURFACE OF THE CONCAVE MIRROR.L
Inventors
- 👤 Joseph La Russa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:29
CPC Classifications
G; G02; G02B; G02B27/00; G02B27/01; G02B27/0149; F; F41; F41G; F41G1/00; F41G1/30; G02B27/0101; G02B2027/0169
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
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 |