US4713941A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cryogenic vessel
Assignee: Mitsubishi Electric Corp
•
Filing: 1986-11-26
•
Granted: 1987-12-22
•
Expires: 2006-11-26
Abstract
Abstract A cryogenic vessel comprises a liquid helium tank including a substantially flat top wall and which contains therein a cryogen-cooled electrical apparatus. The helium tank is surrounded by a radiation shield provided with a cooling tube through which evaporated helium gas flows and the radiation shield is then surrounded by an outer housing. In order to evenly cool the top wall of the cryogen tank, it is provided with a heat conducting plate, a cooling coil or a plurality of evenly distributed inlets for substantially evenly cooling it.
Inventors
- 👤 Katsuyoshi Toyoda
- 👤 Takashi Murai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:41
CPC Classifications
F; F25; F25D; F25D3/00; F25D3/10; F17; F17C; F17C3/00; F17C3/02; F17C3/10; F17C2203/00; F17C2203/01; F17C2203/011; F17C2203/013; F17C2203/03; F17C2203/06; F17C2203/0602; F17C2203/0612; F17C2203/0626; F17C2203/0629; F17C2221/00; F17C2221/01; F17C2221/016; F17C2221/017; F17C2223/00; F17C2223/01; F17C2223/0146; F17C2223/0153; F17C2223/0161
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
138 words
A cryogenic vessel for maintaining an electrical apparatus at a cryogenic temperature, comprising: a cryogen tank including a substantially flat top wall and containing therein the electrical apparatus and a cryogen for cooling said electrical apparatus; a radiation shield, enclosing said cryogen tank, for thermally shielding said cryogen tank against heat radiation from the outside; an outer housing enclosing therein said radiation shield; thermally insulating support means for supporting said cryogen tank and said radiation shield in a thermally insulating relationship; a cooling tube for passing evaporated cryogen in said cryogen tank on said radiation shield for substantially uniformly cooling said radiation shield, said cooling tube having its inlet in the of said outer housing; and cooling means disposed on the top wall of said cryogen tank for substantially uniformly cooling the top wall of said cryogen tank.
Claim 2
Dependent Claim
138 words
A cryogenic vessel for maintaining an electrical apparatus at a cryogenic temperature, comprising: a cryogen tank including a substantially flat top wall and containing therein the electrical apparatus and a cryogen for cooling said electrical apparatus; a radiation shield, enclosing said cryogen tank, for thermally shielding said cryogen tank against heat radiation from the outside; an outer housing enclosing therein said radiation shield; thermally insulating support means for supporting said cryogen tank and said radiation shield in a thermally insulating relationship; a cooling tube for passing evaporated cryogen in said cryogen tank on said radiation shield for substantially uniformly cooling said radiation shield, said cooling tube having its inlet in the of said outer housing; and cooling means disposed on the top wall of said cryogen tank for substantially uniformly cooling the top wall of said cryogen tank.
Claim 3
Dependent Claim
45 words
A cryogenic vessel as claimed in claim 1, wherein said cooling means comprises a heat conducting plate disposed in a heat conducting relationship with the top wall of said cryogen tank, said heat conducting plate being thermally coupled with the inlet of said cooling tube.
Claim 4
Dependent Claim
40 words
A cryogenic vessel as claimed in claim 1, wherein said cooling means comprises a cooling coil disposed on the top wall of said cryogen tank, said cooling coil having an inlet opened at the top wall of said cryogen tank.
Claim 5
Dependent Claim
23 words
A cryogenic vessel as claimed in claim 3, wherein said cooling coil has an outlet connected to the inlet of said cooling tube.
Claim 6
Dependent Claim
37 words
A cryogenic vessel as claimed in claim 1, wherein said cooling means comprises a plurality of inlets of said cooling tube, said plurality of inlets being substantially evenly distributed on said top wall of said cryogen tank.
References Cited (Backward Citations)
US2707377A
Cited
US3133422A
Cited
US3866785A
Cited
US4056949A
Cited
US4107937A
Cited
US4162677A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-12-21 | 1991-06-22 | 1991-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-12-21 | 1995-06-22 | 1995-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-12-21 | 1999-06-22 | 1999-12-22 | $7700.00 | Window Closed / Lapsed |