US3080801A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Zenith camera system
Assignee: PHOTOGRAMMETRY Inc
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Filing: 1960-09-20
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Granted: 1963-03-12
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Expires: 1980-09-20
Abstract
No abstract record available.
Inventors
- 👤 Everett L Merritt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:43
CPC Classifications
G; G01; G01C; G01C9/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
99 words
A ZENITH CAMERA COMPRISING A CAMERA CASING, A LENS SYSTEM HAVING A POSITIVE PLANO-CONVEX LIQUID LENS WITH A SELF-LEVELLING PLANE SURFACE ON TOP, AND A NEGATIVE CONCENTRIC LENS FORMING ITS CONVEX SURFACE BELOW ON A VERTICAL AXIS, A PHOTO-SENSITIVE PLATE BELOW SAID LENSES AND IN ALIGNMENT THEREWITH, AN AUXILIARY LENS SYSTEM MOUNTED ON SAID CASING OVER SAID LIQUID LENS AND HAVING A RETICULE AND A POINT SOURCE OF LIGHT PROJECTING RAYS IN ALIGNMENT WITH SAID FIRST NAMED LENS SYSTEM FOR REFLECTION BY SAID SELF-LEVELLING SURFACE TO INDICATE ON SAID RETICULE THE TILT OF SAID VERTICAL AXIS FROM THE ZENITH.
Claim 2
Dependent Claim
99 words
A ZENITH CAMERA COMPRISING A CAMERA CASING, A LENS SYSTEM HAVING A POSITIVE PLANO-CONVEX LIQUID LENS WITH A SELF-LEVELLING PLANE SURFACE ON TOP, AND A NEGATIVE CONCENTRIC LENS FORMING ITS CONVEX SURFACE BELOW ON A VERTICAL AXIS, A PHOTO-SENSITIVE PLATE BELOW SAID LENSES AND IN ALIGNMENT THEREWITH, AN AUXILIARY LENS SYSTEM MOUNTED ON SAID CASING OVER SAID LIQUID LENS AND HAVING A RETICULE AND A POINT SOURCE OF LIGHT PROJECTING RAYS IN ALIGNMENT WITH SAID FIRST NAMED LENS SYSTEM FOR REFLECTION BY SAID SELF-LEVELLING SURFACE TO INDICATE ON SAID RETICULE THE TILT OF SAID VERTICAL AXIS FROM THE ZENITH.
References Cited (Backward Citations)
US2378526A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-03-11 | 1966-09-10 | 1967-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-03-11 | 1970-09-10 | 1971-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-03-11 | 1974-09-10 | 1975-03-12 | $7700.00 | Window Closed / Lapsed |