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发明名称
Apparatus and method for automatic garage door operation
摘要
Garage door controllers are improved by means to automatically close the doors after a preselected delay time, once they have been opened.
申请公布号
US4939434(A)
申请公布日期
1990.07.03
申请号
US19890357811
申请日期
1989.05.30
申请人
ELSON, ALFRED A.
发明人
ELSON, ALFRED A.
分类号
E05F15/20
主分类号
E05F15/20
代理机构
代理人
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地址
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