US3383877A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Defrost control means for refrigerating systems
Assignee: Robertshaw US Holding Corp
•
Filing: 1966-05-10
•
Granted: 1968-05-21
•
Expires: 1986-05-10
Abstract
No abstract record available.
Inventors
- 👤 Liebermann John
- 👤 Jerome L Lorenz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 04:57
CPC Classifications
F; F25; F25D; F25D21/00; F25D21/002; F25D21/006; F25D21/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
130 words
IN A REFRIGERATION SYSTEM FOR COOLING A STORAGE SPACE AND COMPRISING AN AIR COOLING HEAT EXCHANGE UNIT HAVING SPACED HEAT EXCHANGE SURFACES, BLOWER MEANS OPERABLE AT A GIVEN RATE TO FORCE AIR ACROSS SAID SURFACES AND INTO THE SPACE TO BE COOLED, DEFROSTING MEANS FOR HEATING SAID SURFACES TO REMOVE FROST THEREFROM, CONTROL MEANS FOR SAID DEFROSTING MEANS COMPRISING AN ELECTRICALLY ACTUATED CONTROL ELEMENT, CIRCUIT MEANS FOR CONTROLLING ENERGIZATION OF SAID CONTROL ELEMENT AND INCLUDING A SOURCE OF DC POTENTIAL, SAID ELEMENT BEING CONNECTED ACROSS SAID SOURCE OF DC POTENTIAL, A PAIR OF SELF HEATING RESISTANCE MEMBERS CONNECTED IN SERIES ACROSS SAID DC SOURCE AND COMPRISING A FIRST VOLTAGE DIVIDER NETWORK, MEANS REPSONSIVE TO THE TEMPERATURE OF SAID COOLING UNIT AND CONNECTED ACROSS SAID DC SOURCE AND IN PARALLEL WITH
Claim 2
Dependent Claim
130 words
IN A REFRIGERATION SYSTEM FOR COOLING A STORAGE SPACE AND COMPRISING AN AIR COOLING HEAT EXCHANGE UNIT HAVING SPACED HEAT EXCHANGE SURFACES, BLOWER MEANS OPERABLE AT A GIVEN RATE TO FORCE AIR ACROSS SAID SURFACES AND INTO THE SPACE TO BE COOLED, DEFROSTING MEANS FOR HEATING SAID SURFACES TO REMOVE FROST THEREFROM, CONTROL MEANS FOR SAID DEFROSTING MEANS COMPRISING AN ELECTRICALLY ACTUATED CONTROL ELEMENT, CIRCUIT MEANS FOR CONTROLLING ENERGIZATION OF SAID CONTROL ELEMENT AND INCLUDING A SOURCE OF DC POTENTIAL, SAID ELEMENT BEING CONNECTED ACROSS SAID SOURCE OF DC POTENTIAL, A PAIR OF SELF HEATING RESISTANCE MEMBERS CONNECTED IN SERIES ACROSS SAID DC SOURCE AND COMPRISING A FIRST VOLTAGE DIVIDER NETWORK, MEANS REPSONSIVE TO THE TEMPERATURE OF SAID COOLING UNIT AND CONNECTED ACROSS SAID DC SOURCE AND IN PARALLEL WITH
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) | 1971-05-21 | 1971-11-20 | 1972-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-05-21 | 1975-11-20 | 1976-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-05-21 | 1979-11-20 | 1980-05-21 | $7700.00 | Window Closed / Lapsed |