You can freely build on How Joseph Glidden Invented Modern Barbed Wire
This patent expired in 1893. 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
1874
Expired
1893
Forward citations
4
What this patent covers
The patent describes a method for creating a wire fence by twisting two strands of wire together with a sharp, pointed barb captured between the twists. By twisting the wires, the barb is locked firmly in place so it cannot slide along the fence line. This design allowed for a durable, inexpensive, and easily installed barrier that could withstand the pressure of livestock pushing against it.
What is now free to use
All 0 claims of US 157124 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 smooth, non-barbed wire fencing.
Does not cover fences that use a single strand of wire rather than two twisted strands.
Does not cover barbs that are welded or crimped onto a single wire rather than held by a twist.
Who is building on this today
The technology is now in the public domain, but companies like Bekaert and various global steel manufacturers continue to refine the metallurgy and protective coatings used on the basic twisted-wire structure.
Products built on expired version of this technology
Standard twisted-strand barbed wire used in agricultural fencing
Security perimeter fencing for industrial sites
How to cite this patent in your documentation
Individual. US Patent 157124. Improvement in wire-fences. Granted 1874, expired 1893. 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.