Patent US3126786A successfully refreshed from Google Patents.
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 09:21
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;
References Cited (Backward Citations)
US937266A
Cited
US1136761A
Cited
US1539579A
Cited
US1738942A
Cited
US2153902A
Cited
US2186619A
Cited
US2310273A
Cited
US2351618A
Cited
US2564057A
Cited
US2529664A
Cited
US2496647A
Cited
US2596393A
Cited
US2596394A
Cited
US2669156A
Cited
US2718171A
Cited
US2863356A
Cited
US2669704A
Cited
US2717529A
Cited
US2767611A
Cited
US2811892A
Cited
US2824490A
Cited
US2813455A
Cited
US2859660A
Cited
US2828666A
Cited
US2944461A
Cited
US2979986A
Cited
US2944783A
Cited
US3003394A
Cited
US3081670A
Cited
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 |