Brothers v. United States
Headline: Court affirms that Panama Canal cableways do not infringe a gravity-anchor cable crane patent, allowing the United States to keep using its rigid, counterweighted towers without owing compensation.
Holding: The Court held that the Government’s Panama Canal cableways did not infringe the inventor’s gravity-anchor patent because the towers were rigid and any tightening-induced yielding was incidental and not the patented movable-anchor equivalent.
- Prevents the inventor from recovering compensation for those Panama Canal cableways.
- Allows the United States to keep using rigid, counterweighted cable towers without payment.
- Decision applies to these factual installations; it does not create a broad new patent rule.
Summary
Background
An inventor sued the United States under a 1910 law, seeking payment for the Government’s use of his 1895 patent for an "improvements in cable cranes with gravity anchors" system during Panama Canal construction. The patent had been assigned away and then reassigned back to him shortly before it expired on December 17, 1912, so his claim covered only that brief period. The inventor said the Canal’s cableways used a movable, counterweighted "gravity anchor" at one end and thus infringed his patent.
Reasoning
The Court examined how the Canal cableways were built and used. The government had installed one single and six double cableways with heavy, rigid steel towers anchored by over 150-ton concrete counterweights and mounted on tracks so they could be moved as work progressed. As the canal walls rose, engineers tightened the cables to reduce sag. The lower court found the towers were meant to be and remained rigid; any bending from tightened cables was incidental and did not create the patented outward-tilting gravity anchor. The Supreme Court agreed, saying the Government’s structures did not perform as the inventor’s device required and therefore did not infringe.
Real world impact
Because the Court found no infringement, the inventor cannot recover for those installations during his short ownership period. The United States may continue using and maintaining the same rigid, counterweighted cable towers without owing compensation based on these facts. The ruling turns on the specific structure and use; it does not announce a broad new rule beyond this case.
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