US3126786A
Expired / Lapsed
US
⏱️ 0.0 years remaining
appeldorn
Assignee: —
•
Filing: —
•
Granted: 1964-03-31
•
Expires: 1981-03-31
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:41
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
98 words
AN OVERHEAD PROJECTOR SUITABLE FOR USE IN THE FRONT OF A CLASSROOM TO PROJECT ON A VERTICAL SCREEN A LIGHT IMAGE OF A HORIZONTALLY HELD TRANSPARENCY AND, WHEN IN POSITION FOR SAID PROJECTING, COMPRISING: A BOX-LIKE CASE; A LIGHT SOURCE MOUNTED IN SAID CASE; A TRANSPARENT MEMBER MOUNTED ON SAID CASE TO PROVIDE A SUBSTANTIALLY HORIZONTAL PROJECTION STAGE; A CONDENSING LENS POSITIONED BENEATH AND ADJACENT SAID TRANSPARENT MEMBER AND ABOVE SAID LIGHT SOURCE FOR COLLECTING LIGHT FROM SAID SOURCE AND DIRECTING THE SAME UPWARDLY THROUGH SAID TRANSPARENT MEMBER IN A CONE OF LIGHT HAVING AN INCIDENT AXIAL RAY;
Claim 2
Dependent Claim
98 words
AN OVERHEAD PROJECTOR SUITABLE FOR USE IN THE FRONT OF A CLASSROOM TO PROJECT ON A VERTICAL SCREEN A LIGHT IMAGE OF A HORIZONTALLY HELD TRANSPARENCY AND, WHEN IN POSITION FOR SAID PROJECTING, COMPRISING: A BOX-LIKE CASE; A LIGHT SOURCE MOUNTED IN SAID CASE; A TRANSPARENT MEMBER MOUNTED ON SAID CASE TO PROVIDE A SUBSTANTIALLY HORIZONTAL PROJECTION STAGE; A CONDENSING LENS POSITIONED BENEATH AND ADJACENT SAID TRANSPARENT MEMBER AND ABOVE SAID LIGHT SOURCE FOR COLLECTING LIGHT FROM SAID SOURCE AND DIRECTING THE SAME UPWARDLY THROUGH SAID TRANSPARENT MEMBER IN A CONE OF LIGHT HAVING AN INCIDENT AXIAL RAY;
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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) | 1967-03-31 | 1967-09-30 | 1968-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-03-31 | 1971-09-30 | 1972-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-03-31 | 1975-09-30 | 1976-03-31 | $7700.00 | Window Closed / Lapsed |