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This invention describes a door designed to separate cold and warm areas, like a cold storage locker. It features an inflatable seal made of flexible tubes that expand with air or another fluid to create a tighter barrier. To prevent frost, fluid is continuously circulated through the seals, and sometimes it's heated. The claims focus on this seal being positioned between a movable door panel and a stationary door frame or another movable panel.
Why it matters: Filed before widespread smart controls. Modern sensors and microcontrollers could optimize fluid circulation and heating, making the system more energy-efficient than continuous operation.
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