Patent US3402977A successfully refreshed from Google Patents.
US3402977A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wide angle binocular telescopic instrument having the axes of the telescopes converging towards the observer
Assignee: Farrand Optical Co Inc
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Filing: 1962-04-18
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Granted: 1968-09-24
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Expires: 1982-04-18
Abstract
No abstract record available.
Inventors
- 👤 Russa Joseph La
- 👤 Shenker Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 15:59
CPC Classifications
G; G02; G02B; G02B23/00; G02B23/16; G02B23/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
126 words
A VISUAL TELESCOPIC INSTRUMENT FOR THE OBSERVATION OF A WIDE FIELD OF VIEW, SAID INSTRUMENT COMPRISING TWO TELESCOPES OF SUBSTANTIALLY THE SAME ANGULAR MAGNIFICATION M EACH INCLUDING AN OBJECTIVE AND AN EYEPIECE, AND MEANS TO SUPPORT SAID TELESCOPES WITH THE AXES OF THEIR OBJECTIVES INCLINED TO EACH OTHER AT AN ANGLE WHICH IS GREATER THAN ZERO AND LESS THAN THE ARITHMETIC AVERAGE OF THE ANGULAR FIELDS OF THE TWO TELESCOPES AND WITH THE EXIT PUPILS OF THE TWO TELESCOPES SEPARATED SUBSTANTIALLY BY THE HUMAN INTERPUPILLARY DISTANCE, SAID TELESCOPES HAVING THE AXES OF THEIR EYEPIECES INCLINED TO EACH OTHER BY AN ANGLE WHICH IS SUBSTANTIALLY PROPORTIONAL TO THE ANGULAR SEPARATION OF THE AXES OF SAID OBJECTIVE MULTIPLIED BY M, EACH OF SAID TELESCOPES CONFORMING TO THE RELATION:
Claim 2
Dependent Claim
126 words
A VISUAL TELESCOPIC INSTRUMENT FOR THE OBSERVATION OF A WIDE FIELD OF VIEW, SAID INSTRUMENT COMPRISING TWO TELESCOPES OF SUBSTANTIALLY THE SAME ANGULAR MAGNIFICATION M EACH INCLUDING AN OBJECTIVE AND AN EYEPIECE, AND MEANS TO SUPPORT SAID TELESCOPES WITH THE AXES OF THEIR OBJECTIVES INCLINED TO EACH OTHER AT AN ANGLE WHICH IS GREATER THAN ZERO AND LESS THAN THE ARITHMETIC AVERAGE OF THE ANGULAR FIELDS OF THE TWO TELESCOPES AND WITH THE EXIT PUPILS OF THE TWO TELESCOPES SEPARATED SUBSTANTIALLY BY THE HUMAN INTERPUPILLARY DISTANCE, SAID TELESCOPES HAVING THE AXES OF THEIR EYEPIECES INCLINED TO EACH OTHER BY AN ANGLE WHICH IS SUBSTANTIALLY PROPORTIONAL TO THE ANGULAR SEPARATION OF THE AXES OF SAID OBJECTIVE MULTIPLIED BY M, EACH OF SAID TELESCOPES CONFORMING TO THE RELATION:
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) | 1971-09-24 | 1972-03-25 | 1972-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-09-24 | 1976-03-25 | 1976-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-09-24 | 1980-03-25 | 1980-09-24 | $7700.00 | Window Closed / Lapsed |