US3218908A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adjustable optical prism field splitter
Assignee: American Optical Corp
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Filing: 1961-03-01
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Granted: 1965-11-23
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Expires: 1981-03-01
Abstract
No abstract record available.
Inventors
- 👤 James E Armington
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:07
CPC Classifications
G; G02; G02B; G02B27/00; G02B27/10; G02B27/1066; G02B27/14; G02B27/143
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
104 words
IN AN OPTICAL SYSTEM INCLUDING A VIEWING INSTRUMENT AND A PAIR OF OBJECTIVES FOR FOCUSING THE IMAGES OF SEPARATE OBJECTS IN SIDE-BY-SIDE RELATION IN THE FOCAL PLANE OF THE VIEWING INSTRUMENT, A PRISM UNIT FOR VARYING THE PORTION OF THE FIELD OF THE VIEWING INSTRUMENT OCCUPIED BY THE IMAGES OF THE SEPARATE OBJECTS, SAID UNIT COMPRISING A PRISM ASSOCIATED WITH EACH OBJECTIVE AND A PRISM ASSOCIATED WITH SAID VIEWING INSTRUMENT, SAID PRISMS BEING MOVABLE, AS A UNIT, ALONG A PATH NORMAL TO THE OPTICAL AXIS OF SAID VIEWING INSTRUMENT, AND THE LAST PRISM HAVING ITS APEX AT THE FOCAL PLANE OF THE VIEWING INSTRUMENT.
Claim 2
Dependent Claim
104 words
IN AN OPTICAL SYSTEM INCLUDING A VIEWING INSTRUMENT AND A PAIR OF OBJECTIVES FOR FOCUSING THE IMAGES OF SEPARATE OBJECTS IN SIDE-BY-SIDE RELATION IN THE FOCAL PLANE OF THE VIEWING INSTRUMENT, A PRISM UNIT FOR VARYING THE PORTION OF THE FIELD OF THE VIEWING INSTRUMENT OCCUPIED BY THE IMAGES OF THE SEPARATE OBJECTS, SAID UNIT COMPRISING A PRISM ASSOCIATED WITH EACH OBJECTIVE AND A PRISM ASSOCIATED WITH SAID VIEWING INSTRUMENT, SAID PRISMS BEING MOVABLE, AS A UNIT, ALONG A PATH NORMAL TO THE OPTICAL AXIS OF SAID VIEWING INSTRUMENT, AND THE LAST PRISM HAVING ITS APEX AT THE FOCAL PLANE OF THE VIEWING INSTRUMENT.
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) | 1968-11-22 | 1969-05-24 | 1969-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-22 | 1973-05-24 | 1973-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-22 | 1977-05-24 | 1977-11-23 | $7700.00 | Window Closed / Lapsed |