Patent US3249007A successfully refreshed from Google Patents.
US3249007A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic focusing photographic projector
Assignee: Rollei of America Inc
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Filing: 1964-03-26
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Granted: 1966-05-03
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Expires: 1984-03-26
Abstract
No abstract record available.
Inventors
- 👤 Norman L Stauffer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:48
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/14; G03B21/53
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
180 words
IN COMBINATION WITH A PHOTOGRAPHIC SLIDE PROJECTOR HAVING A MOVABLE OBJECTIVE LENS WHICH IS MOVABLE TO FOCUS A PROJECTED IMAGE OF A SLIDE ON A SCREEN OR THE LIKE, THE IMPROVEMENT INCLUDING, MEANS TO MAINTAIN A GIVEN LENSTO-SLIDE DISTANCE, INCLUDING: FIRST MEANS TO FORM AN IMAGE OF A RADIATION SOURCE AT THE NORMAL PLANE OF THE SLIDE; SECOND MEANS TO RE-IMAGE THE REFLECTED IMAGE OF THE RADIATION SOURCE ON DIFFERENTIAL RADIATION-SENSING MEANS RESPONSIVE TO THE POSITION OF SAID RE-IMAGE THEREON; THIRD MEANS CONTROLLED BY SAID SENSING MEANS TO MOVE THE OBJECTIVE LENS; AND CHARACTERIZING MEANS CONTROLLED BY SAID THIRD MEANS AND OPERATING AT SUCH A RATIO WITH RESPECT TO THE MOVEMENT OF THE OBJECTIVE LENS AS TO MOVE AT LEAST A PORTION OF ONE OF SAID FIRST AND SAID SECOND MEANS TO RESTORE THE RELATIVE POSITION OF SAID RE-IMAGE AND SAID SENSING MEANS SO THAT THE EFFECT OF SAID RE-IMAGE ON THE DIFFERENTIAL PORTIONS OF SAID SENSING MEANS IS SUBSTANTIALLY EQUAL AS THE SLIDE MOVES FROM SAID NORMAL PLANE DUE TO BUCKLING OR ANY CHANGE IN POSITION OF THE SLIDE.
Claim 2
Dependent Claim
180 words
IN COMBINATION WITH A PHOTOGRAPHIC SLIDE PROJECTOR HAVING A MOVABLE OBJECTIVE LENS WHICH IS MOVABLE TO FOCUS A PROJECTED IMAGE OF A SLIDE ON A SCREEN OR THE LIKE, THE IMPROVEMENT INCLUDING, MEANS TO MAINTAIN A GIVEN LENSTO-SLIDE DISTANCE, INCLUDING: FIRST MEANS TO FORM AN IMAGE OF A RADIATION SOURCE AT THE NORMAL PLANE OF THE SLIDE; SECOND MEANS TO RE-IMAGE THE REFLECTED IMAGE OF THE RADIATION SOURCE ON DIFFERENTIAL RADIATION-SENSING MEANS RESPONSIVE TO THE POSITION OF SAID RE-IMAGE THEREON; THIRD MEANS CONTROLLED BY SAID SENSING MEANS TO MOVE THE OBJECTIVE LENS; AND CHARACTERIZING MEANS CONTROLLED BY SAID THIRD MEANS AND OPERATING AT SUCH A RATIO WITH RESPECT TO THE MOVEMENT OF THE OBJECTIVE LENS AS TO MOVE AT LEAST A PORTION OF ONE OF SAID FIRST AND SAID SECOND MEANS TO RESTORE THE RELATIVE POSITION OF SAID RE-IMAGE AND SAID SENSING MEANS SO THAT THE EFFECT OF SAID RE-IMAGE ON THE DIFFERENTIAL PORTIONS OF SAID SENSING MEANS IS SUBSTANTIALLY EQUAL AS THE SLIDE MOVES FROM SAID NORMAL PLANE DUE TO BUCKLING OR ANY CHANGE IN POSITION OF THE SLIDE.
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) | 1969-05-02 | 1969-11-01 | 1970-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-02 | 1973-11-01 | 1974-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-02 | 1977-11-01 | 1978-05-03 | $7700.00 | Window Closed / Lapsed |