US3587094A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic audible signalling devices
Assignee: Individual
•
Filing: 1968-06-07
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Granted: 1971-06-22
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Expires: 1988-06-07
Abstract
Abstract Electronic audible signal devices such as doorbells, buzzers, beepers, telephone bells, school bells, bicycle bells, sirens, signaling bells in general and signalling devices in general are provided by novel combinations of random voltage generators, voltage controlled tone generators, pulsers, triggers, pulse shapers, keyers, audio generators, delay devices, amplifiers and loudspeakers.
Inventors
- 👤 Raymond Scott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 02:51
CPC Classifications
H; H04; H04M; H04M19/00; H04M19/02; H04M19/04; G; G08; G08B; G08B3/00; G08B3/10
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
77 words
In a signalling device the combination of: a plurality of tone generators; an audio amplifier; a speaker coupled to said audio amplifier; a plurality of keyers for applying tones from said tone generators to said amplifier; a switch operated pulse generator for generating a series of pulses to actuate said keyers; and time delay means coupled between said pulse generator and said keyers for supplying actuating signals to said keyers in sequence at predetermined intervals of time.
Claim 2
Dependent Claim
77 words
In a signalling device the combination of: a plurality of tone generators; an audio amplifier; a speaker coupled to said audio amplifier; a plurality of keyers for applying tones from said tone generators to said amplifier; a switch operated pulse generator for generating a series of pulses to actuate said keyers; and time delay means coupled between said pulse generator and said keyers for supplying actuating signals to said keyers in sequence at predetermined intervals of time.
Claim 3
Dependent Claim
26 words
A signalling device as set forth in claim 1; wherein said time delay means is adapted to provide different time intervals between said keyer actuating signals.
Claim 4
Dependent Claim
19 words
A signalling device as set forth in claim 1; wherein said time delay means include unijunction transistor oscillator means.
Claim 5
Dependent Claim
29 words
A signalling device as set forth in claim 1; wherein said time delay means includes a shift register for providing a plurality of timEd output pulses to said keyers.
Claim 6
Dependent Claim
25 words
A signalling device as set forth in claim 1; and means for modifying said pulse generating means in response to continued closure of said switch.
Claim 7
Dependent Claim
30 words
A signalling device as set forth in claim 1 and including; a low frequency random voltage generator coupled to said tone generators for controlling the frequencies of said tone generators.
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) | 1974-06-21 | 1974-12-21 | 1975-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-21 | 1978-12-21 | 1979-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-21 | 1982-12-21 | 1983-06-22 | $7700.00 | Window Closed / Lapsed |