US3198065A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light regulating means for projectors
Assignee: View Master International Group
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Filing: 1960-11-21
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Granted: 1965-08-03
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Expires: 1980-11-21
Abstract
No abstract record available.
Inventors
- 👤 Henry A Bohm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:41
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/14; G03B21/20; G03B21/2053
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
165 words
IN A PROJECTOR FOR PROJECTING TRANSPARENCIES ON A SCREEN WHEREIN THE PROJECTOR INCLUDES A LIGHT SOURCE, A LENS SYSTEM, AND TRANSPARENCY SUPPORT MEANS, CONTROL MEANS FOR INCREASING AND DECREASING THE PROJECTING POWER OF THE PROJECTOR WHEN TRANSPARENCIES OF GREATER AND LESS DENSITY THAN A NORMAL REFERENCE TRANSPARENCY DENSITY ARE BEING PROJECTED, SAID CONTROL MEANS COMPRISING, AN IRIS DIAPHRAGM MOUNTED IN FRONT OF SAID SUPPORT SO THAT THE LATTER IS DISPOSED BETWEEN THE LIGHT SOURCE AND THE IRIS DIAPHRAGM, SAID IRIS DIAPHRAGM BEING ADAPTED TO VARY THE CROSS-SECTIONAL AREA OF THE LIGHT BEAM TRANSMITTED BY THE PROJECTOR TO A SCREEN THEREBY CONTROLLING THE PROJECTING POWER OF THE PROJECTOR, A PHOTO-ELECTRIC CELL MOUNTED BETWEEN SAID SUPPORT MEANS AND SAID IRIS DIAPHRAGM FOR SENSING VAIRATIONS IN THE DENSITY OF DIFFERENT TRANSPARENCIES BEING PROJECTED, AND ELECTRICALLY OPERATED POWER MEANS OPERABLY CONNECTED TO SAID PHOTO-ELECTRIC CELL AND SAID IRIS DIAPHRAGM FOR AUTOMATICALLY CONTROLLING THE PROJECTING POWER OF THE PROJECTOR IN RESPONSE TO VARIATIONS IN DENSITY SENSED BY THE PHOTO-ELECTRIC CELL.
Claim 2
Dependent Claim
165 words
IN A PROJECTOR FOR PROJECTING TRANSPARENCIES ON A SCREEN WHEREIN THE PROJECTOR INCLUDES A LIGHT SOURCE, A LENS SYSTEM, AND TRANSPARENCY SUPPORT MEANS, CONTROL MEANS FOR INCREASING AND DECREASING THE PROJECTING POWER OF THE PROJECTOR WHEN TRANSPARENCIES OF GREATER AND LESS DENSITY THAN A NORMAL REFERENCE TRANSPARENCY DENSITY ARE BEING PROJECTED, SAID CONTROL MEANS COMPRISING, AN IRIS DIAPHRAGM MOUNTED IN FRONT OF SAID SUPPORT SO THAT THE LATTER IS DISPOSED BETWEEN THE LIGHT SOURCE AND THE IRIS DIAPHRAGM, SAID IRIS DIAPHRAGM BEING ADAPTED TO VARY THE CROSS-SECTIONAL AREA OF THE LIGHT BEAM TRANSMITTED BY THE PROJECTOR TO A SCREEN THEREBY CONTROLLING THE PROJECTING POWER OF THE PROJECTOR, A PHOTO-ELECTRIC CELL MOUNTED BETWEEN SAID SUPPORT MEANS AND SAID IRIS DIAPHRAGM FOR SENSING VAIRATIONS IN THE DENSITY OF DIFFERENT TRANSPARENCIES BEING PROJECTED, AND ELECTRICALLY OPERATED POWER MEANS OPERABLY CONNECTED TO SAID PHOTO-ELECTRIC CELL AND SAID IRIS DIAPHRAGM FOR AUTOMATICALLY CONTROLLING THE PROJECTING POWER OF THE PROJECTOR IN RESPONSE TO VARIATIONS IN DENSITY SENSED BY THE PHOTO-ELECTRIC CELL.
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) | 1968-08-02 | 1969-02-01 | 1969-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-02 | 1973-02-01 | 1973-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-02 | 1977-02-01 | 1977-08-03 | $7700.00 | Window Closed / Lapsed |