US3717407A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Audiovisual slides and data-record cards
Assignee: Individual
•
Filing: 1970-03-02
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Granted: 1973-02-20
•
Expires: 1990-03-02
Abstract
Abstract Audiovisual Slides and Audiovisual Data-Record Cards carrying on their surface a stationary spiral sound track surrounding a window receiving a projectable transparency, the spiral sound track being recorded on one surface of the slides or cards, while a spiral groove, formed on the same or the opposite surface of these slides or cards, is used in the special recording and reproduction apparatus for the guidance of the recording and reproduction transducer. An alternative transducer-guidance means, on the slides and cards, is one or more auxilliary tracks coaxial to the sound track.
Inventors
- 👤 P Dimitracopoulos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 17:00
CPC Classifications
G; G03; G03B; G03B31/00; G03B31/06
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
109 words
A thin audiovisual slide comprising: a. a thin, flat support having in one region thereof a projectable transparency image, b. said support having on one of its surfaces a narrow, flat and substantially physically intangible magnetizable track, spirally disposed around said image, on which magnetizable track magnetic signals may be recorded by a magnetic transducer; c. said support having on its other surface a second magnetizable spiral track, similar to, directly and allochirally below, the first-named track, said second track constituting a magnetic guiding track for said transducer; d. at least one of said magnitizable tracks being constituted by magnetizable substance disposed only along its path on said support.
Claim 2
Dependent Claim
109 words
A thin audiovisual slide comprising: a. a thin, flat support having in one region thereof a projectable transparency image, b. said support having on one of its surfaces a narrow, flat and substantially physically intangible magnetizable track, spirally disposed around said image, on which magnetizable track magnetic signals may be recorded by a magnetic transducer; c. said support having on its other surface a second magnetizable spiral track, similar to, directly and allochirally below, the first-named track, said second track constituting a magnetic guiding track for said transducer; d. at least one of said magnitizable tracks being constituted by magnetizable substance disposed only along its path on said support.
Claim 3
Dependent Claim
109 words
A thin audiovisual slide comprising: a. a thin, flat support having in one region thereof a projectable transparency image, b. said support having on one of its surfaces a narrow, flat and substantially physically intangible magnetizable track, spirally disposed around said image, on which magnetizable track magnetic signals may be recorded by a magnetic transducer; c. said support having on its other surface a second magnetizable spiral track, similar to, directly and allochirally below, the first-named track, said second track constituting a magnetic guiding track for said transducer; d. at least one of said magnitizable tracks being constituted by magnetizable substance disposed only along its path on said support.
Claim 4
Dependent Claim
109 words
A thin audiovisual slide comprising: a. a thin, flat support having in one region thereof a projectable transparency image, b. said support having on one of its surfaces a narrow, flat and substantially physically intangible magnetizable track, spirally disposed around said image, on which magnetizable track magnetic signals may be recorded by a magnetic transducer; c. said support having on its other surface a second magnetizable spiral track, similar to, directly and allochirally below, the first-named track, said second track constituting a magnetic guiding track for said transducer; d. at least one of said magnitizable tracks being constituted by magnetizable substance disposed only along its path on said support.
Claim 5
Dependent Claim
22 words
An audiovisual slide according to claim 1, in which said support is formed with a window receiving and fixedly holding said image.
References Cited (Backward Citations)
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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) | 1976-02-20 | 1976-08-21 | 1977-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-20 | 1980-08-21 | 1981-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-20 | 1984-08-21 | 1985-02-20 | $7700.00 | Window Closed / Lapsed |