Patent US3236931A successfully refreshed from Google Patents.
US3236931A
Expired / Lapsed
US
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Electronic musical instrument
Assignee: ACADEMY OF AERONAUTICS
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Filing: 1960-01-15
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Granted: 1966-02-22
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Expires: 1980-01-15
Abstract
No abstract record available.
Inventors
- 👤 Alfred B Freeman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:58
CPC Classifications
G; G10; G10H; G10H5/00; G10H5/02; G10H5/06; G10H1/00; G10H1/02; G10H1/04; G10H1/053; G10H1/057; G10H1/36; G10H1/38; G10H2210/00; G10H2210/571; G10H2210/586
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
110 words
AN ELECTRONIC MUSICAL INSTRUMENT COMPRISING A TONE GENERATING SYSTEM, A SOUND REPRODUCER, A GLOW TUBE CONNECTED TO THE OUTPUT OF SAID TONE GENERATING SYSTEM, MEANS FOR BIASING THE OTHER SIDE OF SAID GLOW TUBE TO MAINTAIN IT IN A NORMALLY DEIONIZED STATE, MEANS FOR KEYING SAID BIASING MEANS TO IONIZE SAID GLOW TUBE, MEANS FOR CONNECTING THE JUNCTION OF SAID BIASING MEANS AND SAID GLOW TUBE TO SAID SOUNDING REPRODUCER, SAID BIASING MEANS BEING OF A TYPE WHICH INCLUDES AN INTERNAL RESISTANCE, AND MEANS FOR BLOCKING PASSAGE OF SIGNALS TO SAID SOUND REPRODUCER UNTIL THEY ARE GREATER IN AMPLITUDE THAN THOSE RESULTING WHEN SAID GLOW TUBE JUST STARTS TO IONIZE.
Claim 2
Dependent Claim
110 words
AN ELECTRONIC MUSICAL INSTRUMENT COMPRISING A TONE GENERATING SYSTEM, A SOUND REPRODUCER, A GLOW TUBE CONNECTED TO THE OUTPUT OF SAID TONE GENERATING SYSTEM, MEANS FOR BIASING THE OTHER SIDE OF SAID GLOW TUBE TO MAINTAIN IT IN A NORMALLY DEIONIZED STATE, MEANS FOR KEYING SAID BIASING MEANS TO IONIZE SAID GLOW TUBE, MEANS FOR CONNECTING THE JUNCTION OF SAID BIASING MEANS AND SAID GLOW TUBE TO SAID SOUNDING REPRODUCER, SAID BIASING MEANS BEING OF A TYPE WHICH INCLUDES AN INTERNAL RESISTANCE, AND MEANS FOR BLOCKING PASSAGE OF SIGNALS TO SAID SOUND REPRODUCER UNTIL THEY ARE GREATER IN AMPLITUDE THAN THOSE RESULTING WHEN SAID GLOW TUBE JUST STARTS TO IONIZE.
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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) | 1969-02-21 | 1969-08-23 | 1970-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-21 | 1973-08-23 | 1974-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-21 | 1977-08-23 | 1978-02-22 | $7700.00 | Window Closed / Lapsed |