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NTIS 바로가기국가/구분 | United States(US) Patent 등록 |
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국제특허분류(IPC7판) |
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출원번호 | US-0849238 (1977-11-07) |
발명자 / 주소 |
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인용정보 | 피인용 횟수 : 2 인용 특허 : 0 |
A solar heat augmented heating system is disclosed in which a solar heat chamber located in an attic is employed selectively to supply heat to the heating system which heats the occupant space, thereby to decrease the load on the conventional heating system. This system is integrated with an improve
An automatically operating vent structure for venting an attic space, comprising a movable valve member and an actuator connected to said valve member to move the same back and forth between open and closed positions, said actuator being in the form of a piston-cylinder device defining a closed expa
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