Patent US1831156A successfully refreshed from Google Patents.
Patent US842168A successfully refreshed from Google Patents.
Patent US3625015A successfully refreshed from Google Patents.
US3625015A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary-valved cryogenic apparatus
Assignee: Cryogenic Technology Inc
•
Filing: 1970-04-02
•
Granted: 1971-12-07
•
Expires: 1990-04-02
Abstract
Abstract CRYOGENIC REFRIGERATOR OF LIQUEFIER OPERATING ON THE CYCLE OF U.S. PAT. 2,966,035. FLOW OF HIGH-PRESSURE FLUID INTO AND WITHDRAWAL OF LOW-PRESSURE FLUID FROM THE APPARATUS IS CONTROLLED BY A ROTARY VALVE WHICH IS READILY INSTALLED AND INTERCHANGED, IF DESIRED, TO ALTER THE TIMING OF THE CYCLE. NO VALVE ADJUSTMENTS AE REQUIRED AFTER ASSEMBLY OF THE APPARATUS.
Inventors
- 👤 Fred F Chellis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:37
CPC Classifications
F; F25; F25B; F25B9/00; F25B9/14; F25B2309/00; F25B2309/003; F25B2309/006
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) | 1974-12-06 | 1975-06-07 | 1975-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-06 | 1979-06-07 | 1979-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-06 | 1983-06-07 | 1983-12-07 | $7700.00 | Window Closed / Lapsed |