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US3220306A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Slide projector with adjustable built-in filter means for changing the reproduction of colors
Assignee: Voigtlander AG
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Filing: 1963-07-08
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Granted: 1965-11-30
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Expires: 1983-07-08
Abstract
No abstract record available.
Inventors
- 👤 Papke Friedrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:26
CPC Classifications
G; G03; G03B; G03B33/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
84 words
A SLIDE PROJECTOR COMPRISING, IN COMBINATION, A PROJECTOR LAMP BULB; A SLIDE HOLDER; AN OPTICAL PROJECTION SYSTEM IN OPERATIVE ASSOCIATED WITH SID BULB AND SAID SLIDE HOLDER, AND POSITIONED ALONG THE OPTICAL AXIS OF THE PROJECTOR; A GLASS FILTER HAVING AT LEAST ONE SURFACE COATED WITH AN INTERFERENCE FILTERING LAYER; AND MEANS MOUNTING SAID GLASS FILTER BETWEEN SAID BULB AND SAID SLIDE HOLDER FOR ANGULAR ADJUSTMENT ABOUT AN AXIS SUBSTANTIALLY PARALLEL TO ITS LIGHT-ENTRY AND EXIT SURFACES AND SUBSTANTIALLY PERPENDICULAR TO SAID OPTICAL AXIS.
Claim 2
Dependent Claim
84 words
A SLIDE PROJECTOR COMPRISING, IN COMBINATION, A PROJECTOR LAMP BULB; A SLIDE HOLDER; AN OPTICAL PROJECTION SYSTEM IN OPERATIVE ASSOCIATED WITH SID BULB AND SAID SLIDE HOLDER, AND POSITIONED ALONG THE OPTICAL AXIS OF THE PROJECTOR; A GLASS FILTER HAVING AT LEAST ONE SURFACE COATED WITH AN INTERFERENCE FILTERING LAYER; AND MEANS MOUNTING SAID GLASS FILTER BETWEEN SAID BULB AND SAID SLIDE HOLDER FOR ANGULAR ADJUSTMENT ABOUT AN AXIS SUBSTANTIALLY PARALLEL TO ITS LIGHT-ENTRY AND EXIT SURFACES AND SUBSTANTIALLY PERPENDICULAR TO SAID OPTICAL AXIS.
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) | 1968-11-29 | 1969-05-31 | 1969-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-29 | 1973-05-31 | 1973-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-29 | 1977-05-31 | 1977-11-30 | $7700.00 | Window Closed / Lapsed |