US3191491A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Head for overhead projectors
Assignee: Charles Beseler Co
•
Filing: 1961-12-26
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Granted: 1965-06-29
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Expires: 1981-12-26
Abstract
No abstract record available.
Inventors
- 👤 Pignone Joseph
- 👤 Philip M Field
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:40
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/132; Y; Y10; Y10S; Y10S353/00; Y10S353/03; Y10S353/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
110 words
A PROJECTION HEAD FOR AN OVERHEAD PROJECTOR COMPRISING: (A) A HOUSING ADAPTED TO RECEIVE A LIGHT BEAM, (B) A LIGHT-DEFLECTING MIRROR PIVOTALLY MOUNTED WITHIN THE HOUSING, (C) A LENS CARRIED BY THE HOUSING, (D) MEANS MOUNTING THE LENS FOR ROTATION ABOUT THE PIVOTAL AXIS OF THE SAID MIRROR, SAID MEANS INCLUDING A ROTATABLE MEMBER HAVING A PLURALITY OF TOOTH ELEMENTS LYING IN A CIRCLE HAVING A CENTER ON THE PIVOTAL AXIS OF THE MIRROR, AND (E) MANUALLY-OPERABLE MEANS FOR SIMULATANEOUSLY ROTATING THE LENS AND THE MIRROR, SAID MEANS INCLUDING A KNOB EXTERNAL OF THE HOUSING AND SECURED TO A PINION GEAR THAT IS IN MESH WITH THE SAID TOOTH ELEMENTS.
Claim 2
Dependent Claim
110 words
A PROJECTION HEAD FOR AN OVERHEAD PROJECTOR COMPRISING: (A) A HOUSING ADAPTED TO RECEIVE A LIGHT BEAM, (B) A LIGHT-DEFLECTING MIRROR PIVOTALLY MOUNTED WITHIN THE HOUSING, (C) A LENS CARRIED BY THE HOUSING, (D) MEANS MOUNTING THE LENS FOR ROTATION ABOUT THE PIVOTAL AXIS OF THE SAID MIRROR, SAID MEANS INCLUDING A ROTATABLE MEMBER HAVING A PLURALITY OF TOOTH ELEMENTS LYING IN A CIRCLE HAVING A CENTER ON THE PIVOTAL AXIS OF THE MIRROR, AND (E) MANUALLY-OPERABLE MEANS FOR SIMULATANEOUSLY ROTATING THE LENS AND THE MIRROR, SAID MEANS INCLUDING A KNOB EXTERNAL OF THE HOUSING AND SECURED TO A PINION GEAR THAT IS IN MESH WITH THE SAID TOOTH ELEMENTS.
References Cited (Backward Citations)
US154607A
Cited
US937266A
Cited
GB397418A
Cited
GB484250A
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US2320247A
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US2496647A
Cited
US2863356A
Cited
US2859660A
Cited
US3055261A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-06-28 | 1968-12-28 | 1969-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-06-28 | 1972-12-28 | 1973-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-06-28 | 1976-12-28 | 1977-06-29 | $7700.00 | Window Closed / Lapsed |