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...During the Civil War, the Confederacy established its own Patent Office which issued 266 patents, a third of which concerned implements of war.
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| Number | Title | Issue Date |
| 4953412 | Pipeline caliper pig An improved pipeline caliper pig for providing a record of the deviations of the interior wall of a pipeline including a pig body assembly having a longitudinal axis and support members so that the pig body assembly is supported within a pipeline, the sup... | 09/04/1990 |
| 4930223 | Bend detector pig A pipeline bend detector pig for measuring the changes in direction of a pipeline having a first pig body assembly with an imaginary longitudinal axis and spaced apart resilient cups for supporting the pig body assembly in a pipeline so that the axis ther... | 06/05/1990 |
| 4628613 | Bend detector for a pipeline pig A bend detector for use on a pipeline pig assembly comprising a front pig element and a rear pig element pivotally connected to the front pig element by the bend detector; the front pig element having a longitudinally disposed housing with a forward drive... | 12/16/1986 |
| 4454655 | Drill pipe measuring tool A distance measuring tool is provided for measuring the length of a drill pipe maintained under tension within a well. The tool includes a unitary instrumentation and instrument drive module which is sealed within an instrument housing and which may be re... | 06/19/1984 |
| 3968568 | Encoder error correction means for use with a distance measuring wheel In the use of a rotatable wheel and a rotation sensing device such as an incremental shaft encoder to measure the longitudinal translation of one member relative to another which extends longitudinally, for example, and wherein the wheel is supported for ... | 07/13/1976 |
