Patent US3699694A successfully refreshed from Google Patents.
US3699694A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid nitrogen refrigeration system
Assignee: SHIPOWNERS CARGO RES ASSOC
•
Filing: 1970-10-26
•
Granted: 1972-10-24
•
Expires: 1990-10-26
Abstract
Abstract The invention relates to a refrigeration system for a cargo container and a method of refrigerating the container in which the interior of the container is connected with a reservoir of liquid nitrogen, a control valve is provided between the container and reservoir to control admittance of nitrogen to the container and the control valve is caused to be opened and closed for predetermined time intervals. The control valve is opened and closed automatically by a timing device, which is preferably powered by pressure from within the reservoir of nitrogen. However, the timing device may be of any, known type.
Inventors
- 👤 Kenneth Calvert Hales
- 👤 Gerald Robin Scrine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:09
CPC Classifications
F; F25; F25D; F25D3/00; F25D3/10; F25D3/105; F25D29/00; F25D29/001; Y; Y10; Y10T; Y10T137/00; Y10T137/206; Y10T137/2065; Y10T137/2071
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
135 words
A refrigeration system for a container comprising a reservoir containing liquid nitrogen and nitrogen vapor, first pipe means for conducting liquid nitrogen from said reservoir to said container, a control valve in said first pipe means arranged to admit pulses of liquid nitrogen into the container, control means for opening and closing said control valve for predetermined time intervals, said control means includes a portion thereof disposed in second pipe means for conducting nitrogen vapor from said reservoir to said control valve, said control valve being responsive only to pressure of said nitrogen vapor in said reservoir to admit pulses of liquid nitrogen into the container through said first pipe means, said control means portion is a valve in said second pipe means controlled by a timing device, and said timing device is electrically operated.
Claim 2
Dependent Claim
135 words
A refrigeration system for a container comprising a reservoir containing liquid nitrogen and nitrogen vapor, first pipe means for conducting liquid nitrogen from said reservoir to said container, a control valve in said first pipe means arranged to admit pulses of liquid nitrogen into the container, control means for opening and closing said control valve for predetermined time intervals, said control means includes a portion thereof disposed in second pipe means for conducting nitrogen vapor from said reservoir to said control valve, said control valve being responsive only to pressure of said nitrogen vapor in said reservoir to admit pulses of liquid nitrogen into the container through said first pipe means, said control means portion is a valve in said second pipe means controlled by a timing device, and said timing device is electrically operated.
Claim 3
Dependent Claim
135 words
A refrigeration system for a container comprising a reservoir containing liquid nitrogen and nitrogen vapor, first pipe means for conducting liquid nitrogen from said reservoir to said container, a control valve in said first pipe means arranged to admit pulses of liquid nitrogen into the container, control means for opening and closing said control valve for predetermined time intervals, said control means includes a portion thereof disposed in second pipe means for conducting nitrogen vapor from said reservoir to said control valve, said control valve being responsive only to pressure of said nitrogen vapor in said reservoir to admit pulses of liquid nitrogen into the container through said first pipe means, said control means portion is a valve in said second pipe means controlled by a timing device, and said timing device is electronically operated.
Claim 4
Dependent Claim
135 words
A refrigeration system for a container comprising a reservoir containing liquid nitrogen and nitrogen vapor, first pipe means for conducting liquid nitrogen from said reservoir to said container, a control valve in said first pipe means arranged to admit pulses of liquid nitrogen into the container, control means for opening and closing said control valve for predetermined time intervals, said control means includes a portion thereof disposed in second pipe means for conducting nitrogen vapor from said reservoir to said control valve, said control valve being responsive only to pressure of said nitrogen vapor in said reservoir to admit pulses of liquid nitrogen into the container through said first pipe means, said control means portion is a valve in said second pipe means controlled by a timing device, and said timing device is electronically operated.
Claim 5
Dependent Claim
135 words
A refrigeration system for a container comprising a reservoir containing liquid nitrogen and nitrogen vapor, first pipe means for conducting liquid nitrogen from said reservoir to said container, a control valve in said first pipe means arranged to admit pulses of liquid nitrogen into the container, control means for opening and closing said control valve for predetermined time intervals, said control means includes a portion thereof disposed in second pipe means for conducting nitrogen vapor from said reservoir to said control valve, said control valve being responsive only to pressure of said nitrogen vapor in said reservoir to admit pulses of liquid nitrogen into the container through said first pipe means, said control means portion is a valve in said second pipe means controlled by a timing device, and said timing device is clockwork operated.
Claim 6
Dependent Claim
135 words
A refrigeration system for a container comprising a reservoir containing liquid nitrogen and nitrogen vapor, first pipe means for conducting liquid nitrogen from said reservoir to said container, a control valve in said first pipe means arranged to admit pulses of liquid nitrogen into the container, control means for opening and closing said control valve for predetermined time intervals, said control means includes a portion thereof disposed in second pipe means for conducting nitrogen vapor from said reservoir to said control valve, said control valve being responsive only to pressure of said nitrogen vapor in said reservoir to admit pulses of liquid nitrogen into the container through said first pipe means, said control means portion is a valve in said second pipe means controlled by a timing device, and said timing device is clockwork operated.
References Cited (Backward Citations)
US2095834A
Cited
US3092974A
Cited
US3258931A
Cited
US3287925A
Cited
US3305000A
Cited
US3552143A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-24 | 1976-04-24 | 1976-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-24 | 1980-04-24 | 1980-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-24 | 1984-04-24 | 1984-10-24 | $7700.00 | Window Closed / Lapsed |