US3260784A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic musical instrument having one or more keyboards
Assignee: Individual
•
Filing: 1964-11-05
•
Granted: 1966-07-12
•
Expires: 1984-11-05
Abstract
No abstract record available.
Inventors
- 👤 Wolfgang J Wehrmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:10
CPC Classifications
G; G10; G10H; G10H1/00; G10H1/02; Y; Y10; Y10S; Y10S84/00; Y10S84/01; Y10S84/02; Y10S84/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
201 words
AN ELECTRONIC MUSICAL INSTRUMENT HAVING ONE OR MORE KEYBOARDS WHICH PERMITS A DUOPHONIC PLAYING ON EACH PLAYING MANUAL IN SUCH A MANNER, THAT UPON DEPRESSION OF A PLURALITY OF KEYS OF ONE MANUAL THE LOWEST OF THE DEPRESSED KEYS DEFINES ON MUSICAL VOICE AND THE HIGHEST OF THE DEPRESSED KEYS DEFINES THE OTHER MUSICAL VOICE, COMPRISING IN COMBINATION PER PLAYING MANUAL AT LEAST THREE OSCLLATORS, TWO OF SAID OSCILLATORS BEING TURNABLE IN STEPS BY MEANS OF SAID KEYS, TWO MODULATORS OR MIXERS EACH FED BY ONE TURNABLE AND ONE FIXED OSCILLATOR AND FOLLOWED BY A LOW-PASS OR BAND-PASS FILTER TO OBTAIN THE DIFFERENTIAL MIXING FREQUENCIES, THE VARIABLE FREQUENCY OF ONE TUNABLE OSCILLATOR BEING LOWER THAN THE CONSTANT FREQUENCY OF THE RESPECTIVE FIXED OSCILLATOR AND THE VARIABLE FREQUENCY OF THE OTHER TUNABLE OSCILLATOR BEING HIGHER THAN THE CONSTANT FREQUENCY OF THE RESPECTIVE FIXED OSCILLATOR, THE FREQUENCIES OF THE TUNABLE OSCILLATORS BEING VARIED BY SWITCHING SIMILAR SERIALLY CONNECTED FREQUENCY DETERMINANT ELEMENTS IN BOTH OSCILLATORS, THE SWITCHING CONTACTS OF SAID KEYS BEING SO CONNECTED IN CIRCUIT THAT UPON DEPRESSION OF A PLURALITY OF KEYS THE TUNABLE OSCILLATOR, THE FREQUENCY OF WHICH IS LOWER THAN THE FREQUENCY OF THE FIXED OSCILLATOR, IS BEING TUNED TO
Claim 2
Dependent Claim
201 words
AN ELECTRONIC MUSICAL INSTRUMENT HAVING ONE OR MORE KEYBOARDS WHICH PERMITS A DUOPHONIC PLAYING ON EACH PLAYING MANUAL IN SUCH A MANNER, THAT UPON DEPRESSION OF A PLURALITY OF KEYS OF ONE MANUAL THE LOWEST OF THE DEPRESSED KEYS DEFINES ON MUSICAL VOICE AND THE HIGHEST OF THE DEPRESSED KEYS DEFINES THE OTHER MUSICAL VOICE, COMPRISING IN COMBINATION PER PLAYING MANUAL AT LEAST THREE OSCLLATORS, TWO OF SAID OSCILLATORS BEING TURNABLE IN STEPS BY MEANS OF SAID KEYS, TWO MODULATORS OR MIXERS EACH FED BY ONE TURNABLE AND ONE FIXED OSCILLATOR AND FOLLOWED BY A LOW-PASS OR BAND-PASS FILTER TO OBTAIN THE DIFFERENTIAL MIXING FREQUENCIES, THE VARIABLE FREQUENCY OF ONE TUNABLE OSCILLATOR BEING LOWER THAN THE CONSTANT FREQUENCY OF THE RESPECTIVE FIXED OSCILLATOR AND THE VARIABLE FREQUENCY OF THE OTHER TUNABLE OSCILLATOR BEING HIGHER THAN THE CONSTANT FREQUENCY OF THE RESPECTIVE FIXED OSCILLATOR, THE FREQUENCIES OF THE TUNABLE OSCILLATORS BEING VARIED BY SWITCHING SIMILAR SERIALLY CONNECTED FREQUENCY DETERMINANT ELEMENTS IN BOTH OSCILLATORS, THE SWITCHING CONTACTS OF SAID KEYS BEING SO CONNECTED IN CIRCUIT THAT UPON DEPRESSION OF A PLURALITY OF KEYS THE TUNABLE OSCILLATOR, THE FREQUENCY OF WHICH IS LOWER THAN THE FREQUENCY OF THE FIXED OSCILLATOR, IS BEING TUNED TO
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-07-11 | 1970-01-10 | 1970-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-07-11 | 1974-01-10 | 1974-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-07-11 | 1978-01-10 | 1978-07-12 | $7700.00 | Window Closed / Lapsed |