Patent US3296924A successfully refreshed from Google Patents.
US3296924A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Single cell image plane position appraisal system for a slide projector
Assignee: Bell and Howell Co
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Filing: 1965-02-23
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Granted: 1967-01-10
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Expires: 1985-02-23
Abstract
No abstract record available.
Inventors
- 👤 Levin Herman
- 👤 Eric K Maxon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:14
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/14; G03B21/53
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
165 words
A FOCUS DETERMINATION APPARATUS FOR A PROJECTOR FOR SLIDES INCLUDING A PROJECTION LENS HAVING A FOCAL PLANE LOCATED A PREDETERMINED DISTANCE THEREBEHIND, EACH OF SAID SLIDES INCLUDING A FILM HELD ALONG ITS EDGES IN A MOUNT, THE INTERIOR PERIPHERAL EDGES OF THE MOUNT DEFINING THE IMAGE AREA TO BE PROJECTED ALONG A PROJECTION AXIS OF THE PROJECTION LENS, THE IMAGE AREA ESTABLISHING AN IMAGE PLANE CAPABLE OF SHIFTING OUT OF COINCIDENCE WITH THE FOCAL PLANE OF THE PROJECTION, LENS UPON "POPPING" OF SAID FILM DURING PROJECTION, THE INVENTION COMPRISING: SUPPORT MEANS ADAPTED TO BE MOVED WITH RESPECT TO THE IMAGE PLANE; MEANS FOR ADJUSTABLY MOUNTING SAID PROJECTION LENS ON SAID SUPPORT MEANS FOR MOVEMENT THEREWITH; A UNIDIRECTIONALLY OPERABLE MOTOR; MEANS OPERABLY CONNECTING SAID MOTOR AND SAID SUPPORT MEANS FOR CAUSING SAID SUPPORT MEANS TO BE CYCLICALLY MOVED AND CAUSING SAID FOCAL PLANE OF SAID LENS TO BE CYCLICALLY MOVED WITH RESPECT TO SAID IMAGE PLANE; A SOURCE OF LIGHT RAYS MOUNTED ON SAID SUPPORT MEANS
Claim 2
Dependent Claim
165 words
A FOCUS DETERMINATION APPARATUS FOR A PROJECTOR FOR SLIDES INCLUDING A PROJECTION LENS HAVING A FOCAL PLANE LOCATED A PREDETERMINED DISTANCE THEREBEHIND, EACH OF SAID SLIDES INCLUDING A FILM HELD ALONG ITS EDGES IN A MOUNT, THE INTERIOR PERIPHERAL EDGES OF THE MOUNT DEFINING THE IMAGE AREA TO BE PROJECTED ALONG A PROJECTION AXIS OF THE PROJECTION LENS, THE IMAGE AREA ESTABLISHING AN IMAGE PLANE CAPABLE OF SHIFTING OUT OF COINCIDENCE WITH THE FOCAL PLANE OF THE PROJECTION, LENS UPON "POPPING" OF SAID FILM DURING PROJECTION, THE INVENTION COMPRISING: SUPPORT MEANS ADAPTED TO BE MOVED WITH RESPECT TO THE IMAGE PLANE; MEANS FOR ADJUSTABLY MOUNTING SAID PROJECTION LENS ON SAID SUPPORT MEANS FOR MOVEMENT THEREWITH; A UNIDIRECTIONALLY OPERABLE MOTOR; MEANS OPERABLY CONNECTING SAID MOTOR AND SAID SUPPORT MEANS FOR CAUSING SAID SUPPORT MEANS TO BE CYCLICALLY MOVED AND CAUSING SAID FOCAL PLANE OF SAID LENS TO BE CYCLICALLY MOVED WITH RESPECT TO SAID IMAGE PLANE; A SOURCE OF LIGHT RAYS MOUNTED ON SAID SUPPORT MEANS
References Cited (Backward Citations)
US2947215A
Cited
US3037423A
Cited
FR1278250A
Cited
US3249001A
Cited
US3249007A
Cited
US3249006A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-01-09 | 1970-07-11 | 1971-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-09 | 1974-07-11 | 1975-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-09 | 1978-07-11 | 1979-01-10 | $7700.00 | Window Closed / Lapsed |