Patent US3249691A successfully refreshed from Google Patents.
US3249691A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wide density range film illuminator
Assignee: General Electric Co
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Filing: 1963-10-14
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Granted: 1966-05-03
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Expires: 1983-10-14
Abstract
No abstract record available.
Inventors
- 👤 John E Bigelow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:31
CPC Classifications
G; G03; G03B; G03B27/00; G03B27/32; G03B27/52
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
116 words
A NEW ARTICLE OF MANUFACTURE FOR VIEWING DIRECTLY THE IMAGE ON A FILM TRANSPARENCY COMPRISING: (A) MEANS FOR GENERATING A LIGHT SPOT THAT IMPINGES ON THE FILM ON ITS SIDE OPPOSITE FROM THE OBSERVER, (B) MEANS FOR CAUSING SAID LIGHT SPOT TO SCAN THE AREA OF THE FILM, (C) MEANS FOR SENSING THE INSTANTANEOUS BRIGHTNESS OF THE FILM OVER THE AREA OF THE SPOT, WHICH SENSING MEANS PRODUCES A CONTROL SIGNAL, AND (D) MEANS THAT ARE RESPONSIVE TO THE CONTROL SIGNAL TO MODULATE THE LIGHT GENERATING MEANS INVERSELY WITH RESPECT TO THE INSTANTANEOUS BRIGHTNESS OF THE SPOT, (E) WHEREBY THE AVERAGE BRIGHTNESS THAT IS PERCEIVED BY THE OBSERVER''S EYE MAY BE CONTROLLED AT A PRESELECTED LEVEL.
Claim 2
Dependent Claim
116 words
A NEW ARTICLE OF MANUFACTURE FOR VIEWING DIRECTLY THE IMAGE ON A FILM TRANSPARENCY COMPRISING: (A) MEANS FOR GENERATING A LIGHT SPOT THAT IMPINGES ON THE FILM ON ITS SIDE OPPOSITE FROM THE OBSERVER, (B) MEANS FOR CAUSING SAID LIGHT SPOT TO SCAN THE AREA OF THE FILM, (C) MEANS FOR SENSING THE INSTANTANEOUS BRIGHTNESS OF THE FILM OVER THE AREA OF THE SPOT, WHICH SENSING MEANS PRODUCES A CONTROL SIGNAL, AND (D) MEANS THAT ARE RESPONSIVE TO THE CONTROL SIGNAL TO MODULATE THE LIGHT GENERATING MEANS INVERSELY WITH RESPECT TO THE INSTANTANEOUS BRIGHTNESS OF THE SPOT, (E) WHEREBY THE AVERAGE BRIGHTNESS THAT IS PERCEIVED BY THE OBSERVER''S EYE MAY BE CONTROLLED AT A PRESELECTED LEVEL.
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) | 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 |