US4035668A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Input-interruption type delayed turn-off control timer
Assignee: Panasonic Holdings Corp
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Filing: 1976-03-17
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Granted: 1977-07-12
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Expires: 1996-03-17
Abstract
Abstract The invention discloses an electronic input-interruption timer for use with an electrical appliance such as a washing machine, a fan, a refrigerator and so on. The timer comprises an integrator consisting of an input resistor and a capacitor, a switching element, a MOS field-effect transistor, a discharge resistor, and a switching circuit operable in response to the magnitude of the drain current of the field-effect transistor; the field-transistor, the switching element, the capacitor and the discharge resistor being embedded or potted in a molded plastic insulation. Since the capacitor and the discharge resistor are completely air- and water-tightly sealed, the highly reliable and dependable operation may be ensured even when used with a water-handling appliance such as a washing machine.
Inventors
- 👤 Shunji Minami
- 👤 Shunzo Oka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:31
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/28; H03K3/00; H03K3/02; H03K3/027
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
149 words
An input-interruption timer comprising (a) an input resistor with one end connected to an input terminal, (b) an input-interruption switching element with one end connected to the other end of said input resistor, (c) a MOS field-effect transistor with its gate connected to the other end of said switching element, (d) a parallel circuit consisting of a nonpolarized electrolytic capacitor and a discharge resistor and connected between the gate of said field-effect transistor and circuit ground, (e) a switching circuit means connected to the output terminal of said field-effect transistor for producing an on and off switching signal in response to the rise and fall of output signal level from said field-effect transistor, (f) said field-effect transistor, said switching element and said parallel circuit being embedded or potted in a molded plastic insulation, and (g) said discharge resistor comprising means for providing the sole discharge path for said capacitor.
Claim 2
Dependent Claim
149 words
An input-interruption timer comprising (a) an input resistor with one end connected to an input terminal, (b) an input-interruption switching element with one end connected to the other end of said input resistor, (c) a MOS field-effect transistor with its gate connected to the other end of said switching element, (d) a parallel circuit consisting of a nonpolarized electrolytic capacitor and a discharge resistor and connected between the gate of said field-effect transistor and circuit ground, (e) a switching circuit means connected to the output terminal of said field-effect transistor for producing an on and off switching signal in response to the rise and fall of output signal level from said field-effect transistor, (f) said field-effect transistor, said switching element and said parallel circuit being embedded or potted in a molded plastic insulation, and (g) said discharge resistor comprising means for providing the sole discharge path for said capacitor.
Claim 3
Dependent Claim
17 words
An input-interruption timer as set forth in claim 1 wherein said switching element is a neon bulb.
Claim 4
Dependent Claim
17 words
An input-interruption timer as set forth in claim 1 wherein said switching element is a reed relay.
Claim 5
Dependent Claim
35 words
An input-interruption timer as set forth in claim 1 wherein a zener diode is interconnected directly in parallel with the capacitor so that the time interval set by said timer can be always maintained constant.
Claim 6
Dependent Claim
64 words
An input-interruption timer as set forth in claim 1 further comprising a transistor with a collector connected to the junction between said input resistor and said switching element, its emitter grounded and its base connected in a feedback path to the output terminal of said switching circuit so that said switching circuit can be cyclically turned on and off with a predetermined recurrence rate.
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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) | 1980-07-11 | 1981-01-10 | 1981-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-11 | 1985-01-10 | 1985-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-11 | 1989-01-10 | 1989-07-12 | $7700.00 | Window Closed / Lapsed |