Invalidity dossier
US 5765743
Outdoor installation type cabinet
Current assignee: Fujitsu Ltd
Added 9/23/2026, 2:38:50 PM
Active provider: DeepSeek · deepseek-flash
Patent summary
Title, assignee, inventors, filing/issue dates, abstract, and a plain-language overview of the claims.
Patent Overview — US 5,765,743 A
Title: Outdoor installation type cabinet
Assignee: Fujitsu Ltd (original assignee, per the supplied text)
Inventor(s): Jun Sakiura; Yasushi Kojima; Naoya Yamazaki; Kazuhiro Iino; Motoko Nakamura
Prior art date: 1996-06-13
Filing date: 1996-11-19
Publication/grant date: 1998-06-16
Legal status shown: Expired – Lifetime; anticipated expiration 2016-11-19 (status presented as an assumption, not a legal conclusion)
Source: https://patents.google.com/patent/US5765743/en
Purpose. The cabinet is installed outdoors to house electronic equipment such as communication equipment, and addresses cooling/radiation of heat generated therein. The text explains that placing a heat exchanging portion at the top leaves the top wall unusable as a radiating surface, and that airflow along all side walls lets solar heat entering a sunlit morning/evening side wall into the cabinet, reducing radiation performance, increasing external-fan operating time (a noise source), and inadequately ejecting harmful gas such as hydrogen from the storage battery.
Plain-language scope. A substantially box-shaped cabinet body has a side wall with first ventilation openings and an outside-air passage between them, with an external fan driving outside air through that passage. A heat exchanger is spaced from the side wall's inner surface and exchanges heat between outside air in the passage and inside air. A circulating fan circulates inside air. A temperature detecting and controlling means senses the side wall temperature and controls the external and circulating fans accordingly. A partition wall with a second ventilation opening divides the interior into an upper equipment accommodating portion and a lower battery accommodating portion; the side wall portion adjacent the battery accommodating portion has a third ventilation opening, and the outside-air passage further extends between the first and second ventilation openings. Figures 1–10 depict the embodiment, heat exchanger, and fan-control flowcharts.
Not established by the excerpt. The excerpt is partial: the text is truncated mid-sentence ("battery accommodating portio…"), claims are not reproduced, and the omitted portions are unavailable here. Consequently, claim wording, claim count, dependencies, and the full control-flow details cannot be confirmed; the remaining embodiments, exact temperature thresholds, and figure contents beyond those listed are likewise unestablished.
Generated 10/1/2026, 9:52:06 PM
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PTAB challenges
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Assignment history
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Prior art
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Obviousness
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Extensions
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Derivative works
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