Patent US3581422A successfully refreshed from Google Patents.
US3581422A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Film holder for slide projector
Assignee: Nikon Corp
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Filing: 1969-08-04
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Granted: 1971-06-01
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Expires: 1989-08-04
Abstract
Abstract A slide film frame for slide projector enables to mounting, dismounting and interchanging of the film with ease. Two glass plates with a film sandwiched therebetween are inserted into the intermediate case of the main frame, and then the main frame is put on one of the covers having arcuated dovetail grooves and thereafter the remaining cover having four projections fittable with the grooves when two covers are relatively rotated by 90*, is put thereon.
Inventors
- 👤 Hidenobu Kondo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:54
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/54; G03B21/64
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
125 words
A slide-frame for transparencies comprising, a pair of protecting glass plates for holding a transparent material therebetween; a main frame having a recess for receiving said glass plates and a film aperture provided at the bottom of said recess; two square covers each provided with a window having larger dimension than said film aperture and for holding said main frame therebetween, the first cover having four arcuated corners each formed with a beveled groove, and the second cover having at its four corners projections having beveled faces engageable with said arcuated corners of the first cover, whereby said two covers being interconnected to each other for holding said main frame and said glass plates when the two covers are relatively rotated with a proper angle.
Claim 2
Dependent Claim
125 words
A slide-frame for transparencies comprising, a pair of protecting glass plates for holding a transparent material therebetween; a main frame having a recess for receiving said glass plates and a film aperture provided at the bottom of said recess; two square covers each provided with a window having larger dimension than said film aperture and for holding said main frame therebetween, the first cover having four arcuated corners each formed with a beveled groove, and the second cover having at its four corners projections having beveled faces engageable with said arcuated corners of the first cover, whereby said two covers being interconnected to each other for holding said main frame and said glass plates when the two covers are relatively rotated with a proper angle.
Claim 3
Dependent Claim
100 words
A slide frame according to claim 1, which further comprising two flanges having spring action provided at the periphery of the main frame, wherein said window of the first cover is formed as having slightly larger dimension than said film aperture, and the window of the second cover is formed as having slightly larger dimension than the periphery of the main frame for inserting the frame within the window, whereby when said two plates are interconnected one of said glass plates is contacted with said first cover and said flanges of said main frame is contacted with said second cover.
Claim 4
Dependent Claim
49 words
A slide frame according to claim 2, which further comprising a projection on the second cover and forked leaf spring provided at the periphery of said main frame, whereby when said two plates are interconnected said projection engages with said forked leaf spring to contribute a click stop action.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-31 | 1974-11-30 | 1975-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-31 | 1978-11-30 | 1979-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-31 | 1982-11-30 | 1983-06-01 | $7700.00 | Window Closed / Lapsed |