US3094581A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Zoom projection lens
Assignee: Individual
•
Filing: 1960-12-29
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Granted: 1963-06-18
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Expires: 1980-12-29
Abstract
No abstract record available.
Inventors
- 👤 Frank G Back
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:29
CPC Classifications
G; G02; G02B; G02B15/00; G02B15/14; G02B15/144; G02B15/1441
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
129 words
A VARIFOCAL PROJECTION LENS SYSTEM COMPRISING A FIXED OUTER BARREL, A COMPENSATOR MOUNT SLIDABLY RECEIVED WITHIN THE FIXED BARREL, A VARIATOR MOUNT CARRIED AT THE FRONT OF THE COMPENSATOR MOUNT, A VARIATOR LENS IN THE VARIATOR MOUNT, A COMPENSATOR LENS CARRIED BY THE COMPENSATOR MOUNT SPACED FROM THE VARIATOR, AN ERECTOR LENS WITHIN THE COMPENSATOR MOUNT BETWEEN THE VARIATOR AND COMPENSATOR RIGIDLY SECURED THROUGH THE COMPENSATOR MOUNT TO THE OUTER BARREL, A RELAY ON THE PROJECTOR END OF THE OUTER BARREL, AND MEANS TO MOVE THE VARIATOR AXIALLY WITH RESPECT TO THE COMPENSATOR TO FOCUS THE LENS SYSTEM AND THEREAFTER SLIDE THE VARIATOR AND COMPENSATOR ALONG THE OPTICAL AXIAL OF THE SYSTEM TO VARY THE FOCAL LENGTH OF THE SYSTEM IN WHICH THE LENSES HAVE THE FOLLOWING OPTICAL CHARACTERISTICS:
Claim 2
Dependent Claim
129 words
A VARIFOCAL PROJECTION LENS SYSTEM COMPRISING A FIXED OUTER BARREL, A COMPENSATOR MOUNT SLIDABLY RECEIVED WITHIN THE FIXED BARREL, A VARIATOR MOUNT CARRIED AT THE FRONT OF THE COMPENSATOR MOUNT, A VARIATOR LENS IN THE VARIATOR MOUNT, A COMPENSATOR LENS CARRIED BY THE COMPENSATOR MOUNT SPACED FROM THE VARIATOR, AN ERECTOR LENS WITHIN THE COMPENSATOR MOUNT BETWEEN THE VARIATOR AND COMPENSATOR RIGIDLY SECURED THROUGH THE COMPENSATOR MOUNT TO THE OUTER BARREL, A RELAY ON THE PROJECTOR END OF THE OUTER BARREL, AND MEANS TO MOVE THE VARIATOR AXIALLY WITH RESPECT TO THE COMPENSATOR TO FOCUS THE LENS SYSTEM AND THEREAFTER SLIDE THE VARIATOR AND COMPENSATOR ALONG THE OPTICAL AXIAL OF THE SYSTEM TO VARY THE FOCAL LENGTH OF THE SYSTEM IN WHICH THE LENSES HAVE THE FOLLOWING OPTICAL CHARACTERISTICS:
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) | 1966-06-17 | 1966-12-17 | 1967-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-06-17 | 1970-12-17 | 1971-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-06-17 | 1974-12-17 | 1975-06-18 | $7700.00 | Window Closed / Lapsed |