US3763488A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Monolithic timer
Assignee: Duracell Inc USA
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Filing: 1971-06-11
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Granted: 1973-10-02
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Expires: 1991-06-11
Abstract
Abstract An electronic timer including a piezoelectric device having a vibratory surface from which an audible sound is radiated. The initiation of the audible sound indicates the termination of a time interval.
Inventors
- 👤 C Klasing
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:27
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/28; G; G03; G03B; G03B17/00; G03B17/48; G03B17/50; H03K17/18
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
201 words
An electronic timer for indicating a time interval comprising timing means, including timing capacitor means and a first timing resistor means and a second timing resistor means, adapted to be coupled to a source of DC energy whereby said timing capacitor means is charged to a determined voltage magnitude through said first timing resistor means; trigger means coupled to said timing means for electrically disconnecting said first timing resistor means from said timing capacitor means and for electrically connecting said timing capacitor means to said second timing resistor means when said capacitor means attains said determined voltage magnitude whereby said timing capacitor means is charged through said second timing resistor means; and indicator means including a piezoelectric means and a pair of transistors, a base of a first one of said transistors coupled to a first surface of said piezoelectric means, a collector of said first transistor connected to a base of a second one of said transistors, a collector of said second transistor coupled to an opposite surface of said piezoelectric means, the collectors of said transistors coupled to said trigger means, said indicating means biased to conduction by said trigger means when said capacitor means attains said voltage magnitude.
Claim 2
Dependent Claim
201 words
An electronic timer for indicating a time interval comprising timing means, including timing capacitor means and a first timing resistor means and a second timing resistor means, adapted to be coupled to a source of DC energy whereby said timing capacitor means is charged to a determined voltage magnitude through said first timing resistor means; trigger means coupled to said timing means for electrically disconnecting said first timing resistor means from said timing capacitor means and for electrically connecting said timing capacitor means to said second timing resistor means when said capacitor means attains said determined voltage magnitude whereby said timing capacitor means is charged through said second timing resistor means; and indicator means including a piezoelectric means and a pair of transistors, a base of a first one of said transistors coupled to a first surface of said piezoelectric means, a collector of said first transistor connected to a base of a second one of said transistors, a collector of said second transistor coupled to an opposite surface of said piezoelectric means, the collectors of said transistors coupled to said trigger means, said indicating means biased to conduction by said trigger means when said capacitor means attains said voltage magnitude.
Claim 3
Dependent Claim
13 words
The electronic timer of claim 1, wherein said piezoelectric means is barium titanate.
Claim 4
Dependent Claim
27 words
ThE electronic timer of claim 1, wherein said trigger means biases said indicator means to conduction upon coupling of said timing capacitor to said second timing resistor.
Claim 5
Dependent Claim
28 words
The electronic timer of claim 3, wherein said second resistor causes said capacitor to be charged at a rate faster than the rate of said first resistor means.
Claim 6
Dependent Claim
31 words
The electronic timer of claim 3, further including a line switch means connected between said DC energy source and said trigger means biased to conduction upon energization of said electonic timer.
Claim 7
Dependent Claim
35 words
The electonic timer of claim 5, wherein said second timing register means further includes means for maintaining said line switch means conducting during charging of said capacitor through said first resistor and said second resistor.
Claim 8
Dependent Claim
27 words
The electronic timer of claim 6, further including manual switch means connected between said line switch means and said timing capacitor for initially energizing siad electronic timer.
Claim 9
Dependent Claim
39 words
The electronic timer of claim 6, further including semiconductor switch means for biasing said line switch means to non-conduction whereby said electronic timer is de-energized upon said capacitor being charged to a determined value through said second timing resistor.
Claim 10
Dependent Claim
14 words
The electonic timer of claim 8, wherein said electronic timer is an integrated circuit.
Claim 11
Dependent Claim
29 words
The electronic timer of claim 5, further including a source of illumination coupled to said line switch means and illuminating upon said line switch means being biased to conduction.
Claim 12
Dependent Claim
14 words
The electronic timer of claim 5, wherein said source of illumination is a lamp.
Claim 13
Dependent Claim
20 words
The electronic timer of claim 1, further including voltage regulator means compensating for variations in voltage of said DC source.
Claim 14
Dependent Claim
36 words
The electronic timer of claim 12 wherein said voltage regulator means includes serially connected diodes coupled between said source and said trigger means and resistor means connecting said diodes to ground and said semiconductor switch means.
Claim 15
Dependent Claim
200 words
An electronic timer indicating two time intervals comprising an electrical circuit including in combination: a. first and second switch means, energizing said first switch means completing a circuit to said second switch means to energize same, said second switch means energizing a timing means, said timing means determining the length of said first time interval, b. trigger means cooperating with said timing means to stop said first time interval and start a second time interval, said timing means determining the length of said second time interval, said trigger means includes a pair of cascaded transistors, the base of the first transistor connected to the said timing means through a first switching means, said cascaded pair of transistors connected to a pair of parallel connected transistor amplifiers through a second switching means, the collector of one of said transistor amplifiers connected to said indicator means, the collector of the other transistor amplifier connected to said second switch means through a second switching means, c. said second switch means responsive to said timing means to stop said timing means at said second time interval and re-set said timer, and d. indicator means responsive to said trigger means during said second time interval.
Claim 16
Dependent Claim
200 words
An electronic timer indicating two time intervals comprising an electrical circuit including in combination: a. first and second switch means, energizing said first switch means completing a circuit to said second switch means to energize same, said second switch means energizing a timing means, said timing means determining the length of said first time interval, b. trigger means cooperating with said timing means to stop said first time interval and start a second time interval, said timing means determining the length of said second time interval, said trigger means includes a pair of cascaded transistors, the base of the first transistor connected to the said timing means through a first switching means, said cascaded pair of transistors connected to a pair of parallel connected transistor amplifiers through a second switching means, the collector of one of said transistor amplifiers connected to said indicator means, the collector of the other transistor amplifier connected to said second switch means through a second switching means, c. said second switch means responsive to said timing means to stop said timing means at said second time interval and re-set said timer, and d. indicator means responsive to said trigger means during said second time interval.
Claim 17
Dependent Claim
17 words
An electronic timer according to claim 14 wherein said indicating means is an audible sound emitting means.
Claim 18
Dependent Claim
17 words
An electronic timer according to claim 15, wherein said audible sound emitting means is a piezoelectric device.
Claim 19
Dependent Claim
35 words
An electronic timer according to claim 16, wherein said indicator means including said piezoelectric device further includes oscillating means for alternatively stressing opposite surfaces of piezoelectric device whereby said piezoelectric device emits an audible sound.
Claim 20
Dependent Claim
22 words
An electronic timer according to claim 17, wherein said oscillating means includes at least one pair of transistors alternately biased to conduction.
Claim 21
Dependent Claim
63 words
An electronic timer according to claim 18, wherein said pair of transistors includes a base of a first one of said transistors coupled to a first surface of said piezoelectric device, a collector of said first transistor connected to a base of a second one of said transistors, a collector of said second transistor coupled to an opposite surface of said piezoelectric device.
Claim 22
Dependent Claim
14 words
An electronic timer according to claim 19, wherein said piezoelectric device is barium titanate.
Claim 23
Dependent Claim
27 words
the electronic timer of claim 14, the combination further including voltage regulating means compensating for voltage variations when a DC voltage is applied to said electrical circuit.
Claim 24
Dependent Claim
37 words
The electronic timer according to claim 21 wherein said voltage regulating means includes serially connected diodes coupled between a voltage source and said trigger means and resistor means coupled to one of said diodes and to ground.
Claim 25
Dependent Claim
14 words
The electonic timer according to claim 21 wherein there are two of said diodes.
Claim 26
Dependent Claim
16 words
An electonic timer according to claim 14 wherein said two time intervals are of different length.
Claim 27
Dependent Claim
22 words
An electonic timer according to claim 14 wherein said combination further includes a second indicating means responsive to said second switch means.
Claim 28
Dependent Claim
77 words
An electonic timer according to claim 14 wherein said timing means includes a timing capacitor means and first and second timing resistors connected to a source of electrical energy, said timing capacitor means charged to a predetermined voltage level through said first timing resistor when said second switch means is energized, said trigger means electrically disconnecting said first timing resistor from said timing capacitor means and electrically connecting said second timing resistor to said timing capacitor means.
Claim 29
Dependent Claim
16 words
An electronic timer according to claim 14 wherein said first and second switching means are diodes.
Claim 30
Dependent Claim
22 words
An electronic timer according to claim 14 wherein said first switch means is a manual switch opening and closing said electrical circuit.
Claim 31
Dependent Claim
76 words
An electronic timer according to claim 14 wherein said second switch means includes first, second and third transistors connected collector to base, emitter to base, the collector of said third transistor connected to said first switch means and to a line switch of said electrical circuit, and its emitter to ground, said trigger means connected to the base of said first transistor, and the collectors of said first and second transistor connected to said line switch.
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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) | 1976-10-01 | 1977-04-02 | 1977-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-01 | 1981-04-02 | 1981-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-01 | 1985-04-02 | 1985-10-02 | $7700.00 | Window Closed / Lapsed |