Patent US3896697A successfully refreshed from Google Patents.
US3896697A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for testing the tune of musical instruments
Assignee: Individual
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Filing: 1973-10-17
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Granted: 1975-07-29
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Expires: 1993-10-17
Abstract
Abstract A device for testing the tune of musical instruments comprises an adjustable, active, band-pass filter for transmitting in-tune electrical signals and for rejecting out-of-tune electrical signals corresponding to tones of improper pitch produced by a musical instrument to be tuned. The device also includes an indicator operated in response to transmitted signals. The musical instrument, itself, may be provided with means for converting a generated musical tone to an electrical signal, which is then fed into the device, or the device may include such means.
Inventors
- 👤 Gary L Iannone
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:31
CPC Classifications
G; G10; G10G; G10G7/00; G10G7/02; G01; G01H; G01H1/00; G01H1/04; G01H1/06
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
114 words
A device for testing the tune of musical instruments comprising a precalibrated, stepwise adjustable, active, bandpass filter for transmitting at any given time an electrical signal of substantially predetermined frequency blocking other signals; indicating means arranged to be operated in response to signals transmitted by said band-pass filter; means for feeding to the band-pass filter electrical signals corresponding in frequency to the pitch of a tone produced by a musical instrument; by-pass circuitry interconnectable with the feeding means; means for connecting said by-pass circuitry with an output amplifier; and switching means for connecting either said bandpass filter or said by-pass circuitry with said feeding means; and means for providing power to the band-pass filter.
Claim 2
Independent Claim
114 words
A device for testing the tune of musical instruments comprising a precalibrated, stepwise adjustable, active, bandpass filter for transmitting at any given time an electrical signal of substantially predetermined frequency blocking other signals; indicating means arranged to be operated in response to signals transmitted by said band-pass filter; means for feeding to the band-pass filter electrical signals corresponding in frequency to the pitch of a tone produced by a musical instrument; by-pass circuitry interconnectable with the feeding means; means for connecting said by-pass circuitry with an output amplifier; and switching means for connecting either said bandpass filter or said by-pass circuitry with said feeding means; and means for providing power to the band-pass filter.
Claim 3
Dependent Claim
16 words
A device in accordance with claim 1, wherein the band-pass filter comprises circuitry of twin-tee type.
Claim 4
Dependent Claim
37 words
A device in accordance with claim 2 wherein the twin-tee circuitry comprises fixed capacitors, sets of fixed and variable resistances, and at least one selection switch for operatively connecting certain of said sets at any given time.
Claim 5
Dependent Claim
16 words
A device in accordance with claim 3, wherein the values of the fixed capacitors are symmetrical.
Claim 6
Dependent Claim
54 words
A device in accordance with claim 1, wherein the means for connecting said by-pass circuitry with an output amplifier is a standard male plug, and wherein the device is mounted in a housing rigidly connected to said plug whereby the device is held in place when said plug is connected to the output amplifier.
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) | 1978-07-28 | 1979-01-27 | 1979-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-28 | 1983-01-27 | 1983-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-28 | 1987-01-27 | 1987-07-29 | $7700.00 | Window Closed / Lapsed |