US3382750A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronically sounding blackboard
Assignee: Individual
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Filing: 1966-07-26
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Granted: 1968-05-14
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Expires: 1986-07-26
Abstract
No abstract record available.
Inventors
- 👤 Hiyama Mitsunaga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:43
CPC Classifications
G; G09; G09B; G09B15/00; G09B15/02; G09B15/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
114 words
AN ELECTRONICALLY SOUNDING BLACKBOARD COMPRISING A BASE PLATE WHICH IS ENTIRELY COVERED AND ATTACHED WITH ALUMINIUM LEAF, AN INSULATING FILM WHICH ADHERES ON AND ENTIRELY COVERS INSULATING HORIZONTAL LINES WHICH ARE DRAWN AT REGULAR INTERVALS WITH INSULATING PAINT AND WHICH FORM A NARROW AND THIN ELEVATED LAYER ON SAID INSULATING FILM, ELECTRO-CONDUCTIVE FILM STRIPES WHICH ARE FORMED ON SAID INSULATING FILM BETWEEN EACH PAIR OF THE INSULATING HORIZONTAL LINES AND WHICH ARE COPLANAR WITH SAID HORIZONTAL LINES AND CONNECT WITH OSCILLATORS AND AN AMPLIFIER FOR PRODUCING PROPER SIGNALS RESPECTIVELY, A BATON WHICH IS ATTACHED TO THE AMPLIFIER BY A CONNECTOR IN THE EXTREMITY OF SAID BATON, AND A SPEAKER WHICH CONNECTS WITH SAID AMPLIFIER.
Claim 2
Dependent Claim
114 words
AN ELECTRONICALLY SOUNDING BLACKBOARD COMPRISING A BASE PLATE WHICH IS ENTIRELY COVERED AND ATTACHED WITH ALUMINIUM LEAF, AN INSULATING FILM WHICH ADHERES ON AND ENTIRELY COVERS INSULATING HORIZONTAL LINES WHICH ARE DRAWN AT REGULAR INTERVALS WITH INSULATING PAINT AND WHICH FORM A NARROW AND THIN ELEVATED LAYER ON SAID INSULATING FILM, ELECTRO-CONDUCTIVE FILM STRIPES WHICH ARE FORMED ON SAID INSULATING FILM BETWEEN EACH PAIR OF THE INSULATING HORIZONTAL LINES AND WHICH ARE COPLANAR WITH SAID HORIZONTAL LINES AND CONNECT WITH OSCILLATORS AND AN AMPLIFIER FOR PRODUCING PROPER SIGNALS RESPECTIVELY, A BATON WHICH IS ATTACHED TO THE AMPLIFIER BY A CONNECTOR IN THE EXTREMITY OF SAID BATON, AND A SPEAKER WHICH CONNECTS WITH SAID AMPLIFIER.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-05-14 | 1971-11-13 | 1972-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-05-14 | 1975-11-13 | 1976-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-05-14 | 1979-11-13 | 1980-05-14 | $7700.00 | Window Closed / Lapsed |