Patent US1951844A successfully refreshed from Google Patents.
US3125863A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dense gas helium refrigerator
Assignee: CRYO VAC Inc
•
Filing: —
•
Granted: 1964-03-24
•
Expires: 1981-03-24
Abstract
No abstract record available.
Inventors
- 👤 Jr Charles B Hood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:19
CPC Classifications
F; F17; F17C; F17C3/00; F17C3/02; F17C3/08; F17C3/085; F25; F25B; F25B9/00; F25B9/06; F25B2400/00; F25B2400/14; F25B2400/141
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
113 words
IN A CRYOGENIC REFRIGERATOR THE COMBINATION OF A WARM HEAT EXCHANGER INCLUDING A WARMER PATH AND A COLDER PATH; A COLD HEAT EXCHANGER INCLUDING A WARMER PATH IN SERIES WITH SAID WARMER PATH OF SAID WARM HEAT EXCHANGER ADN A COLDER PATH INSERIES WITHSAID COLDER PATH OF SAID WARM HEAT EXCHANGER; MEANS CONTAINING AN EVAPORATING BATH OF LIQUIFIED CRYOGENIC GAS; AND A GAS PURIFIER IN SAID BATH ADN INCLUDING AN INLET CONNECTED TO THE OUTLET OF THE WARMER PATH OF SAID WARM HEAT EXCHANGER AND AN OUTLET CONNECTED TO THE INLET OF THE WARMER PATH OF SAID COLD HEAT EXCHANGER, THE TEMPERATURE DIFFERENCE BETWEEN THE TWO PATHS OF THE COLD HEAT EXCHANGER BEING
References Cited (Backward Citations)
US1867748A
Cited
US2003310A
Cited
US2737032A
Cited
US2791891A
Cited
US2959034A
Cited
US2957318A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-03-24 | 1967-09-23 | 1968-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-03-24 | 1971-09-23 | 1972-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-03-24 | 1975-09-23 | 1976-03-24 | $7700.00 | Window Closed / Lapsed |