US3207029A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manually adjustable overhead projector mounted on a desk
Assignee: Charles Beseler Co
•
Filing: 1961-10-19
•
Granted: 1965-09-21
•
Expires: 1981-10-19
Abstract
No abstract record available.
Inventors
- 👤 Philip M Field
- 👤 Mandel Samuel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:52
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/132; Y; Y10; Y10S; Y10S353/00; Y10S353/03
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
122 words
IN AN OVERHEAD PROJECTOR OF THE TYPE COMPRISING A LIGHT SOURCE AND ASSOCIATED OPTICAL SYSTEM FOR DIRECTING A LIGHT BEAM THROUGH A TRANSPARENT MEMBER WHICH SUPPORTS THE MATERIAL TO BE PROJECTED AND THEN THROUGH A PROJECTION HEAD FOR PROJECTING AN IMAGE OF THE MATERIAL ONTO A SCREEN; THE IMPROVEMENT WHEREIN THE TRANSPARENT MEMBER CLOSES AN OPENING IN THE TOP OF A DESK, THE SIDE LIGHT SOURCE AND ASSOCIATED OPTICAL SYSTEM ARE DISPOSED WITHIN A DRAWER OF THE DESK, AND THE SAID HEAD IS MECHANICALLY COUPLED TO THE DESK, BY MANUALLY-OPERABLE MEANS FOR EFFECTING A COMBINED LINEAR, AND ROTARY MOVEMENT OF THE HEAD FROM AN OPERATING POSITION IN THE PATH OF THE LIGHT BEAM TO A NON-OPERATING POSITION REMOVED FROM THE LIGHT BEAM.
Claim 2
Dependent Claim
122 words
IN AN OVERHEAD PROJECTOR OF THE TYPE COMPRISING A LIGHT SOURCE AND ASSOCIATED OPTICAL SYSTEM FOR DIRECTING A LIGHT BEAM THROUGH A TRANSPARENT MEMBER WHICH SUPPORTS THE MATERIAL TO BE PROJECTED AND THEN THROUGH A PROJECTION HEAD FOR PROJECTING AN IMAGE OF THE MATERIAL ONTO A SCREEN; THE IMPROVEMENT WHEREIN THE TRANSPARENT MEMBER CLOSES AN OPENING IN THE TOP OF A DESK, THE SIDE LIGHT SOURCE AND ASSOCIATED OPTICAL SYSTEM ARE DISPOSED WITHIN A DRAWER OF THE DESK, AND THE SAID HEAD IS MECHANICALLY COUPLED TO THE DESK, BY MANUALLY-OPERABLE MEANS FOR EFFECTING A COMBINED LINEAR, AND ROTARY MOVEMENT OF THE HEAD FROM AN OPERATING POSITION IN THE PATH OF THE LIGHT BEAM TO A NON-OPERATING POSITION REMOVED FROM THE LIGHT BEAM.
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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) | 1968-09-20 | 1969-03-22 | 1969-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-20 | 1973-03-22 | 1973-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-20 | 1977-03-22 | 1977-09-21 | $7700.00 | Window Closed / Lapsed |