| 发明名称 |
PREVENTING FREEZE-UP OF ICE HOLES |
| 摘要 |
<p>The invention disclosed relates to the prevention of ice holes from freezing shut. A novel device for achieving this result comprises an inflatable bladder which is positioned in the ice hole and inflated to completely occupy the hole. Retaining means is provided for achoring the bladder in position. Continuous access to the water is thus provided for maintaining water supply, placement of scientific apparatus etc., in cold environments.</p> |
| 申请公布号 |
CA1074584(A) |
申请公布日期 |
1980.04.01 |
| 申请号 |
CA19780312537 |
申请日期 |
1978.09.27 |
| 申请人 |
MAJESTY (HER) IN RIGHT OF CANADA AS REPRESENTED BY THE MINISTER OF |
发明人 |
MILNE, ALLEN R.;HUGHES, THOMAS;SEWELL, RICHARD B. H. |
| 分类号 |
E21B7/00;E21B33/00;E21B33/127;(IPC1-7):21B33/127 |
主分类号 |
E21B7/00 |
| 代理机构 |
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代理人 |
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| 主权项 |
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| 地址 |
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