US3644032A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Audiovisual projection slides
Assignee: AV Corp
•
Filing: 1967-02-10
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Granted: 1972-02-22
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Expires: 1987-02-10
Abstract
Abstract An audiovisual projection slide having a spiral sound track surrounding a projectable transparency, the sound track being formed on a magnetized film impressed with a spiral groove and the magnetized film having optionally beneath it a spongy, resilient, backing layer. The slide may constitute a data record card carrying on its surface the spiral sound track surrounding a window adapted to receive a projectable transparency, but in this case, the spiral sound track may also be of other desirable types, for example, phonographic.
Inventors
- 👤 Panayotis C Dimitracopoulos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:40
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/54; G03B21/64; G03B31/00; G03B31/06; G06; G06K; G06K19/00; G06K19/06; G06K19/08; Y; Y10; Y10S; Y10S40/00; Y10S40/906
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
131 words
A unitary combined sound and picture-projection slide comprising a flat and substantially rectangular support formed with an aperture receiving and fixedly holding a projection transparency; said support fixedly carrying a magnetizable thin plastic sheet impressed with a raised narrow spiral wall whose convolutions are spaced to define a stationary, spiral magnetic sound track along which track the shoe of a magnetic transducer may be guided between adjacent convolutions of said wall, said track substantially surrounding said aperture, said slide including a layer of resilient cushioning material between said support and said sheet, thus allowing elementary areas of said sound track to move and float under the pressure of said shoe, and thus ensuring good contact between the surface of said sound track and said shoe during recording, reproducing and erasing operations.
Claim 2
Dependent Claim
131 words
A unitary combined sound and picture-projection slide comprising a flat and substantially rectangular support formed with an aperture receiving and fixedly holding a projection transparency; said support fixedly carrying a magnetizable thin plastic sheet impressed with a raised narrow spiral wall whose convolutions are spaced to define a stationary, spiral magnetic sound track along which track the shoe of a magnetic transducer may be guided between adjacent convolutions of said wall, said track substantially surrounding said aperture, said slide including a layer of resilient cushioning material between said support and said sheet, thus allowing elementary areas of said sound track to move and float under the pressure of said shoe, and thus ensuring good contact between the surface of said sound track and said shoe during recording, reproducing and erasing operations.
Claim 3
Dependent Claim
21 words
An audiovisual slide according to claim 1, in which said sheet has the form of a flat ring surrounding said aperture.
Claim 4
Dependent Claim
25 words
An audiovisual slide according to claim 1, in which said layer of resilient cushioning material has the form of a flat ring surrounding said aperture.
Claim 5
Dependent Claim
33 words
An audiovisual slide according to claim 1, in which the surface area of said sheet is substantially the same as that of said support and said sheet having a window overlying said aperture.
Claim 6
Dependent Claim
33 words
An audiovisual slide according to claim 1, in which the surface area of said layer is substantially the same as that of said support, and said layer having a window overlying said aperture.
Claim 7
Dependent Claim
17 words
An audiovisual slide according to claim 1, in which said layer is a layer of foam plastic.
Claim 8
Dependent Claim
17 words
An audiovisual slide according to claim 1, in which said layer is a layer of sponge rubber.
Claim 9
Dependent Claim
20 words
An audiOvisual slide according to claim 1; said support having handling notches formed in each of two opposite edges thereof.
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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) | 1975-02-21 | 1975-08-23 | 1976-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-21 | 1979-08-23 | 1980-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-21 | 1983-08-23 | 1984-02-22 | $7700.00 | Window Closed / Lapsed |