Number | Name | Date | Kind |
---|---|---|---|
2615519 | Carr | Oct 1952 | |
2620037 | McClendon | Dec 1952 | |
3322197 | Baker et al. | May 1967 | |
3971436 | Lee | Jul 1976 | |
4427065 | Watson | Jan 1984 | |
4674573 | Bode | Jun 1987 | |
4782894 | LaFleur | Nov 1988 |
Entry |
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LaFleur Petroleum Services Brochure Which Begins "Now . . . A Safe, Sure and Proven Cementing Head That Permits Positive Plug Drop With Continuous Cement Flow.", Believed To Be Published More Than One Year Prior To Apr. 27, 1990. |
LaFleur Petroleum Services Brochure With Front Page Containing The Word "Fasdrop", Believed To Be Published More Than One Year Prior To Apr. 27, 1990. |
Halliburton Company Technical Data Sheet C-1152, "Remote Control For Release Of Cementing Plug" dated Nov., 1965. |