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...that Kleenex tissue was originally designed to be a gas mask filter? It was developed at the beginning of World War I to replace cotton, which was then in short supply as a surgical dressing.
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US Patent 4085991 - Electrical socket
US Patent Issued on April 25, 1978
Estimated Patent Expiration Date:
April 25, 1995Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
Estimated Patent Expiration Date:
April 25, 1995Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.AbstractAn electrical socket has a body with a pair of spaced-apart channels for receiving the prongs of a male electrical plug. A pair of electrical contacts are mounted in said body respectively adjacent to said channels and in communication therewith. A pair of legs are pivotally mounted on the body and are movable between locking and unlocking positions. Each leg carries a finger which enters the aperture of the prong on the associated electrical plug when the legs are in the locking position thereof. | InventorsApplicationNo. 789409 filed on 04/21/1977US Classes:439/346Adapted to engage contact of mating partExaminersPrimary: Abrams, NeilAttorney, Agent or FirmUS Patent References2732531, 2844805, 2888662, 3182280, 3192499International ClassH01R 013/54 |
