US3373655A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Slide projector
Assignee: DONALD T NICHOLAS
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Filing: 1966-08-29
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Granted: 1968-03-19
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Expires: 1986-08-29
Abstract
No abstract record available.
Inventors
- 👤 Donald T Nicholas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 03:12
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/001
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
200 words
AN IMPROVEMENT FOR A SLIDE PROJECTOR COMPRISING A FRAME, A HOUSING ON SAID FRAME, AN ILLUMINATING LAMP DISPOSED IN SAID HOUSING, A PROJECTION LENS AND A CONDENSER LENS FORMING A WINDOW FOR SAID HOUSING BETWEEN SAID ILLUMINATING LAMP AND SAID PROJECTION LENS, SAID IMPROVEMENT PERMITTING SAID SLIDE PROJECTOR TO PROJECT AN ENLARGED IMAGE OF A MICROFILM TRANSPARENCY DISPOSED OFF CENTER IN A WINDOW IN A CARD, SAID IMPROVEMENT COMPRISING: A PAIR OF SUBSTANTIALLY PARALLEL RAILS EACH MOUNTED ON EACH SIDE OF SAID WINDOW ON SAID HOUSING, A SUBSTANTIALLY RECTANGULAR CARD HOLDER PLATE HAVING BENT-OVER EDGES DISPOSED ALONG ONE BOTTOM LONG SIDE AND TWO SHORT SIDES, SAID BENT-OVER EDGES FORMING A CHANNEL ALONG EACH OF SAID SIDES ADAPTED TO BE ENGAGED BY AN EDGE OF SAID CARD, A RECTANGULAR APERTURE DIMENSIONALLY AT LEAST EQUAL TO SAID WINDOW AND DISPOSED RELATIVELY TO THE SIDES OF SAID PLATE SO AS TO SUBSTANTIALLY REGISTER WITH THE POSITION OF THE MICROFILM TRANSPARENCY IN SAID CARD AND A PAIR OF U-CHANNEL SHAPED SLIDE MEMBERS DISPOSED ON TWO SIDES OF SAID RECTANGULAR APERTURE SUBSTANTIALLY PARALLEL TO THE SHORT SIDES OF SAID PLATE AND ADAPTED TO SLIDABLY ENGAGE SAID RAILS FOR FASTENING OF SAID PLATE TO SAID HOUSING.
Claim 2
Dependent Claim
200 words
AN IMPROVEMENT FOR A SLIDE PROJECTOR COMPRISING A FRAME, A HOUSING ON SAID FRAME, AN ILLUMINATING LAMP DISPOSED IN SAID HOUSING, A PROJECTION LENS AND A CONDENSER LENS FORMING A WINDOW FOR SAID HOUSING BETWEEN SAID ILLUMINATING LAMP AND SAID PROJECTION LENS, SAID IMPROVEMENT PERMITTING SAID SLIDE PROJECTOR TO PROJECT AN ENLARGED IMAGE OF A MICROFILM TRANSPARENCY DISPOSED OFF CENTER IN A WINDOW IN A CARD, SAID IMPROVEMENT COMPRISING: A PAIR OF SUBSTANTIALLY PARALLEL RAILS EACH MOUNTED ON EACH SIDE OF SAID WINDOW ON SAID HOUSING, A SUBSTANTIALLY RECTANGULAR CARD HOLDER PLATE HAVING BENT-OVER EDGES DISPOSED ALONG ONE BOTTOM LONG SIDE AND TWO SHORT SIDES, SAID BENT-OVER EDGES FORMING A CHANNEL ALONG EACH OF SAID SIDES ADAPTED TO BE ENGAGED BY AN EDGE OF SAID CARD, A RECTANGULAR APERTURE DIMENSIONALLY AT LEAST EQUAL TO SAID WINDOW AND DISPOSED RELATIVELY TO THE SIDES OF SAID PLATE SO AS TO SUBSTANTIALLY REGISTER WITH THE POSITION OF THE MICROFILM TRANSPARENCY IN SAID CARD AND A PAIR OF U-CHANNEL SHAPED SLIDE MEMBERS DISPOSED ON TWO SIDES OF SAID RECTANGULAR APERTURE SUBSTANTIALLY PARALLEL TO THE SHORT SIDES OF SAID PLATE AND ADAPTED TO SLIDABLY ENGAGE SAID RAILS FOR FASTENING OF SAID PLATE TO SAID HOUSING.
References Cited (Backward Citations)
US2712268A
Cited
US2869421A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-03-19 | 1971-09-18 | 1972-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-03-19 | 1975-09-18 | 1976-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-03-19 | 1979-09-18 | 1980-03-19 | $7700.00 | Window Closed / Lapsed |