US3767937A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Timer for an appliance
Assignee: Duracell Inc USA
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Filing: 1971-08-11
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Granted: 1973-10-23
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Expires: 1991-08-11
Abstract
Abstract A timer includes a bank of switching means, a bank of impedance means, means coupling at least one of the switching means to at least one of the impedance means, and capacitor means connected in series to the bank of impedance means.
Inventors
- 👤 P Schmidgall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:19
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/64; H05B6/66; H05B6/68; H03; H03K; H03K17/00; H03K17/28; H03K17/292
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
88 words
A timer comprising: a. power switching means b. power supply means responsive to said power switching means, c. timing means responsive to said power supply means, and d. power turn-off means responsive to said timing means to deenergize said power switching means, e. said timing means including a bank of switching means, a bank of impedance means, a patch chord coupling at least one of said switching means to at least one of said impedance means, and capacitor means connected in series to said bank of impedance means.
Claim 2
Dependent Claim
88 words
A timer comprising: a. power switching means b. power supply means responsive to said power switching means, c. timing means responsive to said power supply means, and d. power turn-off means responsive to said timing means to deenergize said power switching means, e. said timing means including a bank of switching means, a bank of impedance means, a patch chord coupling at least one of said switching means to at least one of said impedance means, and capacitor means connected in series to said bank of impedance means.
Claim 3
Dependent Claim
12 words
A timer according to claim 1 wherein said impedance means are resistors.
Claim 4
Dependent Claim
15 words
A timer according to claim 1 wherein said capacitor means is at least one capacitor.
Claim 5
Dependent Claim
16 words
A timer according to claim 1 wherein said timing means further includes a relaxation oscillator means.
Claim 6
Dependent Claim
15 words
A timer according to claim 4 wherein said relaxation oscillator includes a programmable unijunction transistor.
Claim 7
Dependent Claim
21 words
A timer according to claim 1 wherein said power turn-off means includes a switching means in series with a relay means.
Claim 8
Dependent Claim
20 words
A timer according to claim 6 wherein said switching means includes an SCR and said relay means includes a solenoid.
Claim 9
Dependent Claim
21 words
A timer according to claim 1 wherein said power supply means includes a series combination of a diode, resistor, and capacitor.
Claim 10
Dependent Claim
91 words
In combination, an appliance operable for a predetermined length of time and a timer providing said predetermined length of time; said timer including a timing selector means including a bank of switch means, a bank of impedance means, and a patch chord selectively coupling at least one of said switch means to at least one of said impedance means; and a capacitor means in series with said bank of impedance means; selectively coupling of said switching means with said impedance means providing said predetermined length of time said appliance is operable.
Claim 11
Dependent Claim
91 words
In combination, an appliance operable for a predetermined length of time and a timer providing said predetermined length of time; said timer including a timing selector means including a bank of switch means, a bank of impedance means, and a patch chord selectively coupling at least one of said switch means to at least one of said impedance means; and a capacitor means in series with said bank of impedance means; selectively coupling of said switching means with said impedance means providing said predetermined length of time said appliance is operable.
Claim 12
Dependent Claim
22 words
The combination according to claim 9 further including safety shut-off means responsive to a condition of said appliance to shut-off said timer.
Claim 13
Dependent Claim
17 words
The combination according to claim 10 wherein said safety shut-off means is included in said timing means.
Claim 14
Dependent Claim
21 words
The combination according to claim 9 wherein said appliance is operable in response to a relay means responsive to said timer.
References Cited (Backward Citations)
US3397323A
Cited
US3553483A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-22 | 1977-04-23 | 1977-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-22 | 1981-04-23 | 1981-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-22 | 1985-04-23 | 1985-10-23 | $7700.00 | Window Closed / Lapsed |