E21D 5/01

Technology

Patent/Pub #	Title	Filing Date	Issue/Publication Date	Patent Owner
5176470	Water-tight bore shaft foundation	Jun 13, 91	Jan 05, 93	Ruhrkohle AG, Gewerkschaft Auguste Victoria,
4890676	Apparatus and method for lining bore holes with pre-formed lining shells	Oct 12, 88	Jan 02, 90	Caledonian Mining Co., Ltd.
4460293	Mine shaft liner	Jul 03, 80	Jul 17, 84	Santa Fe International Corporation
4423981	Concrete lining of drilled shaft	Jul 22, 81	Jan 03, 84	Santa Fe International Corporation

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Number of patents in all portfolios	100 (maximum)	1000 (maximum)	2000 (maximum)	Unlimited
Follows in all categories (Watch)	10 (maximum)	50 (maximum)	500 (maximum)	Unlimited
Maximum number of portfolios	5 (maximum)	10 (maximum)	100 (maximum)	Unlimited
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Number of patents in all portfolios	100 (maximum)	1000 (maximum)	2000 (maximum)	Unlimited
Watches in all categories (Watch)	10 (maximum)	50 (maximum)	500 (maximum)	Unlimited
Maximum number of portfolios	5 (maximum)	10 (maximum)	100 (maximum)	Unlimited
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Number of patents in all portfolios	100 (maximum)	1000 (maximum)	2000 (maximum)	Unlimited
Follows in all categories (Watch)	10 (maximum)	50 (maximum)	500 (maximum)	Unlimited
Maximum number of portfolios	5 (maximum)	10 (maximum)	100 (maximum)	Unlimited
Maximum number of comparisons	1 (maximum)	5 (maximum)	20 (maximum)	Unlimited