You can freely build on Buckminster Fuller's Geodesic Dome Building Design
This patent expired in 1971. 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
1954
Expired
1971
Forward citations
120
What this patent covers
The patent describes a method for constructing a spherical structure using a network of interconnected struts arranged in a geodesic pattern. By using triangles, the design ensures that force is distributed across the entire frame rather than concentrating on single points. This allows the structure to support its own weight and external loads, such as wind or snow, without needing internal support columns. It enables the creation of large, open interiors using relatively lightweight materials.
What is now free to use
All 0 claims of US 2682235 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 traditional rectangular building construction methods.
Does not cover non-triangular structural frameworks.
Does not cover the specific chemical composition of the building materials used.
Who is building on this today
Architects and civil engineers continue to use geodesic principles for sustainable housing and specialized enclosures. Companies specializing in modular construction and rapid-deployment shelters frequently utilize these geometric principles.
Products built on expired version of this technology
The Montreal Biosphere
Epcot's Spaceship Earth
Military radar domes
Portable disaster relief shelters
How to cite this patent in your documentation
Individual. US Patent 2682235. Building construction. Granted 1954, expired 1971. 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.