US3222877A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low temperature refrigerator
Assignee: Individual
•
Filing: 1964-01-22
•
Granted: 1965-12-14
•
Expires: 1984-01-22
Abstract
No abstract record available.
Inventors
- 👤 Frank P Brooks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:58
CPC Classifications
F; F25; F25B; F25B9/00; F25B9/14; F25B31/00; F25B31/002; Y; Y10; Y10T; Y10T74/00; Y10T74/18; Y10T74/18056; Y10T74/18208
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
102 words
A HEAT PUMP COMPRISING IN COMBINATION (A) FIRST AND SECOND MECHANICAL HEAT PUMP STAGES, EACH STAGE HAVING A LOW TEMPERATURE PORTION AND A HIGH TEMPERATURE PORTION, (1) EACH STAGE (A) SUBSTANTIALLY CONFINING A WORKING FLUID THEREIN, AND (B) BEING OPERABLE TO COMPRESS THE WORKING FLUID THEREIN, THEREBY HEATING THE FLUID, IN THE STAGE''S HIGH TEMPERATURE PORTION AND EXPAND THE WORKING FLUID, THEREBY COOLING IT, IN THE STAGE''S LOW TEMPERATURE PORTION, (2) SAID LOW TEMPERATURE PORTION OF SAID FIRST STAGE BEING IN CLOSE THERMAL RELATIONSHIP WITH SAID HIGH TEMPERATURE PORTION OF SAID SECOND STAGE, AND (3) SAID HIGH TEMPERATURE PORTION OF SAID FIRST
Claim 2
Dependent Claim
102 words
A HEAT PUMP COMPRISING IN COMBINATION (A) FIRST AND SECOND MECHANICAL HEAT PUMP STAGES, EACH STAGE HAVING A LOW TEMPERATURE PORTION AND A HIGH TEMPERATURE PORTION, (1) EACH STAGE (A) SUBSTANTIALLY CONFINING A WORKING FLUID THEREIN, AND (B) BEING OPERABLE TO COMPRESS THE WORKING FLUID THEREIN, THEREBY HEATING THE FLUID, IN THE STAGE''S HIGH TEMPERATURE PORTION AND EXPAND THE WORKING FLUID, THEREBY COOLING IT, IN THE STAGE''S LOW TEMPERATURE PORTION, (2) SAID LOW TEMPERATURE PORTION OF SAID FIRST STAGE BEING IN CLOSE THERMAL RELATIONSHIP WITH SAID HIGH TEMPERATURE PORTION OF SAID SECOND STAGE, AND (3) SAID HIGH TEMPERATURE PORTION OF SAID FIRST
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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) | 1968-12-13 | 1969-06-14 | 1969-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-13 | 1973-06-14 | 1973-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-13 | 1977-06-14 | 1977-12-14 | $7700.00 | Window Closed / Lapsed |