Wallboard jack
Patent 4712771 Issued on December 15, 1987. Estimated Expiration Date: 
April 21, 2006. 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.
April 21, 2006. 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 671554 1018282 2692753 2904309 2989286 InventorsApplicationNo. 06/854020 filed on 04/21/1986US Classes:254/131Special engaging featureExaminersPrimary: Watson, Robert C.Attorney, Agent or FirmInternational ClassB66F 15/00 (20060101)AbstractA jack for raising and holding articles such as wallboard, comprising a base [15] with a pivotally attached lever assembly [16] mounted on the base in a manner that downward pressure on one end will raise the other end. Releasable ratchet means [35] is connected for holding the lever in the raised position. | |
