Patent US3559422A successfully refreshed from Google Patents.
US3559422A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Means for regulating the temperature of refrigerators
Assignee: Holzer Patent AG
•
Filing: 1968-12-09
•
Granted: 1971-02-02
•
Expires: 1988-12-09
Abstract
Abstract THIS INVENTION RELATES TO A SYSTEM FOR REGULATING THE TEMPERATURE OF REFRIGERATING EQUIPMENT AND HAS FOR ONE OF ITS OBJECTIVES FROST CONTROL. THIS IS ACHIEVED BECAUSE THE COLD OUTPUT IS HERE REGULATED BY AN ELECTRONIC ANALOGUE VALUE CONTROL ACCORDING TO A VARIABLE TEMPERATURE SETTING A CONTINUOUSLY MEASURED ACTUAL TEMPERATURE AND A MEASSUREMENT VALUE WHICH IS AN ANALOGUE OF THE AMOUNT OF COLD PRODUCED. CONSTANT TEMPERATURE IS ALSO MAINTAINED WHEN THE REFRIGERATOR DOOR IS OPENED BY AUTOMATICALLY SHIFTING THE RESPONSE VALUE OF TEMPERATURE CONTROL TO A TEMPERATURE VALUE THAT IS SUBSTANTIALY LOWER THAN NORMAL OPERATION.
Inventors
- 👤 Walter Holzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:26
CPC Classifications
F; F25; F25D; F25D21/00; F25D21/06; F25D21/08; F25B; F25B41/00; F25B41/20; F25B2600/00; F25B2600/02; F25B2600/025; F25B2600/0253; F25B2600/25; F25B2600/2501; F25B2700/00; F25B2700/17; F25B2700/171; F25B2700/21; F25B2700/2104; F25B2700/2117; F25D2400/00; F25D2400/30; Y; Y02; Y02B; Y02B30/00; Y02B30/70
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1974-02-01 | 1974-08-03 | 1975-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-01 | 1978-08-03 | 1979-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-01 | 1982-08-03 | 1983-02-02 | $7700.00 | Window Closed / Lapsed |