US3267689A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High and low temperature refrigeration systems with common defrosting means
Assignee: Individual
•
Filing: 1964-03-19
•
Granted: 1966-08-23
•
Expires: 1984-03-19
Abstract
No abstract record available.
Inventors
- 👤 Ralph C Liebert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:01
CPC Classifications
F; F25; F25D; F25D21/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
90 words
A REFRIGERATION SYSTEM FOR REFRIGERATING SEPARATE AREAS TO SELECTIVELY DIFFERENT TEMPERATURES COMPRISING A FIRST CLOSED SYSTEM INCLUDING COOLING COILS IN A FIRST AREA REFRIGERATED, A LIQUID COOLANT, MEANS FOR CIRCULATING SAID LIQUID COOLANT THROUGH SAID COILS, AND FIRST REFRIGERATION MEANS INCLUDING CHILLER MEANS FOR MAINTAINING SAID LIQUID COOLANT AT A PREDETERMINED TEMPERATURE BELOW THE TEMPERATURE OF SAID FIRST AREA, A SECOND CLOSED SYSTEM INCLUDING SECOND COOLING COILS IN A SECOND AREA REFRIGERATED, A SECOND LIQUID COOLANT, MEANS FOR CIRCULATING SAID SECOND LIQUID COOLANT THROUGH SAID SECOND COILS, AND SECOND RE-
Claim 2
Dependent Claim
90 words
A REFRIGERATION SYSTEM FOR REFRIGERATING SEPARATE AREAS TO SELECTIVELY DIFFERENT TEMPERATURES COMPRISING A FIRST CLOSED SYSTEM INCLUDING COOLING COILS IN A FIRST AREA REFRIGERATED, A LIQUID COOLANT, MEANS FOR CIRCULATING SAID LIQUID COOLANT THROUGH SAID COILS, AND FIRST REFRIGERATION MEANS INCLUDING CHILLER MEANS FOR MAINTAINING SAID LIQUID COOLANT AT A PREDETERMINED TEMPERATURE BELOW THE TEMPERATURE OF SAID FIRST AREA, A SECOND CLOSED SYSTEM INCLUDING SECOND COOLING COILS IN A SECOND AREA REFRIGERATED, A SECOND LIQUID COOLANT, MEANS FOR CIRCULATING SAID SECOND LIQUID COOLANT THROUGH SAID SECOND COILS, AND SECOND RE-
References Cited (Backward Citations)
USRE21600E
Cited
US1980688A
Cited
US2512545A
Cited
US2739453A
Cited
US3024008A
Cited
US2893218A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-08-22 | 1970-02-21 | 1970-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-22 | 1974-02-21 | 1974-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-22 | 1978-02-21 | 1978-08-23 | $7700.00 | Window Closed / Lapsed |