Patent US3285275A successfully refreshed from Google Patents.
US3285275A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid level detector
Assignee: Dale Valve Co
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Filing: 1964-01-15
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Granted: 1966-11-15
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Expires: 1984-01-15
Abstract
No abstract record available.
Inventors
- 👤 Jr Robert W Couffer
- 👤 Joseph M Algino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:12
CPC Classifications
D; D06; D06F; D06F39/00; D06F39/08; D06F39/087; Y; Y10; Y10T; Y10T137/00; Y10T137/7287; Y10T137/7306
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
140 words
A WASHING MACHINE IN COMBINATION WITH A THERMISTOR WATER LEVEL CONTROL SYSTEM FOR DETECTING AND CONTROLLING WATER LEVEL IN A WATER CHAMBER COMPRISING: A PLURALITY OF NEGATIVE THERMISTORS MOUNTED AT DIFFERENT LEVELS WITHIN A WATER CHAMBER IN THE WASHING MACHINE, A SELECTOR HAVING A PLURALITY OF SWITCHES, EACH SELECTOR SWITCH BEING CONNECTED TO ONE THERMISTOR AND BEING NORMALLY OPEN, A NORMALLY CLOSED MIXING VALVE CONNECTED TO A WATER SUPPLY AND ADAPTED TO SUPPLY WATER TO THE WASHING MACHINE WATER CHAMBER, A SOLENOID TO OPEN AND CLOSE SAID MIXING VALVE, SAID SOLENOID BEING CONNECTED TO THE THERMISTORS, MEANS TO SUPPLY POWER TO THE THERMISTORS THROUGH THE SELECTOR SWITCHES. AN ELECTRIC CIRCUIT INCLUDING ONE ONLY OF SAID THERMISTORS AS SELECTED BY THE SAID SELECTOR TO TRANSMIT CURRENT TO THE SAID SOLENOID AS A FUNCTION OF AMBIENT TEMPERATURE OF THE SAID SELECTED THERMISTOR
Claim 2
Dependent Claim
140 words
A WASHING MACHINE IN COMBINATION WITH A THERMISTOR WATER LEVEL CONTROL SYSTEM FOR DETECTING AND CONTROLLING WATER LEVEL IN A WATER CHAMBER COMPRISING: A PLURALITY OF NEGATIVE THERMISTORS MOUNTED AT DIFFERENT LEVELS WITHIN A WATER CHAMBER IN THE WASHING MACHINE, A SELECTOR HAVING A PLURALITY OF SWITCHES, EACH SELECTOR SWITCH BEING CONNECTED TO ONE THERMISTOR AND BEING NORMALLY OPEN, A NORMALLY CLOSED MIXING VALVE CONNECTED TO A WATER SUPPLY AND ADAPTED TO SUPPLY WATER TO THE WASHING MACHINE WATER CHAMBER, A SOLENOID TO OPEN AND CLOSE SAID MIXING VALVE, SAID SOLENOID BEING CONNECTED TO THE THERMISTORS, MEANS TO SUPPLY POWER TO THE THERMISTORS THROUGH THE SELECTOR SWITCHES. AN ELECTRIC CIRCUIT INCLUDING ONE ONLY OF SAID THERMISTORS AS SELECTED BY THE SAID SELECTOR TO TRANSMIT CURRENT TO THE SAID SOLENOID AS A FUNCTION OF AMBIENT TEMPERATURE OF THE SAID SELECTED THERMISTOR
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-11-14 | 1970-05-16 | 1970-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-14 | 1974-05-16 | 1974-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-14 | 1978-05-16 | 1978-11-15 | $7700.00 | Window Closed / Lapsed |