You can freely build on How the Modern Alkaline Battery Was Invented

What this patent covers

This patent describes a specific chemical and physical structure for a dry cell battery. It focuses on the arrangement of the anode and cathode materials to improve energy density and shelf life. By using a specific electrolyte and separator configuration, it allows the battery to maintain a steady voltage over a longer period compared to the older Leclanche cells that were standard at the time.

What is now free to use

All 0 claims of US 2960558 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 lithium-ion or other rechargeable battery chemistries.

• Does not cover the internal circuitry of the devices the battery powers.

• Does not cover button-cell batteries with different structural sealing methods.

Who is building on this today

Companies like Energizer and Duracell continue to refine the chemistry and manufacturing processes established by this foundational work. Modern research focuses on improving these designs for higher capacity and eco-friendly disposal.

Products built on expired version of this technology

How to cite this patent in your documentation

Union Carbide Corp. US Patent 2960558. Dry cell. Granted 1960, expired 1977. 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.