You can freely build on How Leo Fender's Tremolo Bridge Changes Guitar Pitch
This patent expired in 1974. Every claim — 0 independent, 0 dependent — is now unenforceable. Anyone can use, reproduce, manufacture, sell, or offer for sale this technology without a license.
Original assignee
Individual
Patent granted
1956
Expired
1974
Forward citations
92
What this patent covers
The device functions as a movable bridge assembly for a stringed instrument. It uses a spring-loaded mechanism to anchor the strings, allowing the player to pivot the bridge using a connected arm or lever. When the player pushes or pulls this lever, the bridge tilts, which increases or decreases the tension on all strings at once. This action creates the signature vibrato or pitch-bending effect commonly heard in rock and blues music.
What is now free to use
All 0 claims of US 2741146 are in the public domain. Specifically:
The 0 dependent claims add narrowing limitations and are also free.
What is NOT covered
Patent expiry frees this specific invention. Separately-patented improvements made after expiry may still be protected.
Does not cover fixed bridges that have no mechanism for pitch modulation.
Does not cover electronic or digital pitch-shifting effects.
Does not cover tremolo systems that lock the strings at the nut, such as the Floyd Rose.
Does not cover non-stringed instruments.
Who is building on this today
Fender Musical Instruments Corporation continues to utilize and refine this design in their standard production models. Many third-party hardware manufacturers like Gotoh and Wilkinson also build improved versions based on these original mechanical principles.
Products built on expired version of this technology
Fender Stratocaster synchronized tremolo bridge
Modern vintage-style tremolo systems
Two-point tremolo bridges on contemporary electric guitars
How to cite this patent in your documentation
Individual. US Patent 2741146. Tremolo device for stringed instruments. Granted 1956, expired 1974. Now in the public domain.
Note: This is a convenience citation. Consult a patent attorney for formal freedom-to-operate analysis.
PatentBrief is an educational resource and does not provide legal advice. Patent expiration information is derived from USPTO records and may not reflect continuation patents, divisional filings, or separately-patented improvements. For commercial use or production decisions, obtain a formal freedom-to-operate (FTO) opinion from a registered patent attorney.