Plastic screw anchor
Patent 4579492 Issued on April 1, 1986. Estimated Expiration Date: 
July 27, 2003. Estimated 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.
July 27, 2003. Estimated 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.Patent References 2836215 3241428 3323404 Plastic screw socket Patent #: 4240323 InventorsAssigneeApplicationNo. 06/517772 filed on 07/27/1983US Classes:411/80.1, Comprising a head and expandable portions spread by fastener (e.g., drywall anchor)411/15, HAVING SEPARATE EXPANDER MEANS411/182Nonmetallic nut, resiliently deformed during assemblyExaminersPrimary: Dorner, Kenneth J.Assistant: Wilson, Neill R. Attorney, Agent or FirmInternational ClassesF16B 21/08 (20060101)F16B 21/00 (20060101) F16B 37/04 (20060101) F16B 5/06 (20060101) Foreign Application Priority Data1982-10-12 JPAbstractA plastic screw anchor having legs each formed with a recess which provides the leg with good flexibility whereby the legs can easily deform during the insertion thereof into an aperture of a supporting plate and also provides a strong grip between the screw anchor and the supporting plate. A wing integrally formed on each leg prevents the screw anchor from coming out of the aperture after having once been inserted therein.Other References
Field of SearchHAVING SEPARATE EXPANDER MEANSIdentical segments Frangible member Frangibly connected expander Including sleeve and distinct tapered expander (e.g., anchor bolt type) Folded blank type Means to engage extends through aperture Means to engage grasps an edge of substructure And has projection contacting periphery of aperture | |
