This is a plain-language summary of a public patent. It is written for general readers and is not a substitute for the granted claims. For the authoritative, legally operative text, see the official record linked below. Nothing here should be read as legal advice or as the scope of protection.
01 The problem
Much of the radioactivity in a liquid waste stream comes from a small number of troublesome isotopes — for example cesium-137, strontium-90, and technetium-99. Conventional approaches often solidify the entire volume of water along with the isotopes, producing a large amount of radioactive waste to transport, store, and dispose of. The challenge is to separate just the problem isotopes, concentrate them, and lock them into a form that will not leach over the long term.
02 The approach, in plain language
This invention pairs two steps that are usually handled separately:
- Isotope-specific capture. The waste is passed over ion-specific media — sorbents tuned to grab particular radionuclides — so the target isotopes are pulled out of solution while the bulk water passes through with far less activity.
- Vitrification of the loaded media. Rather than disposing of spent media as loose secondary waste, the isotope-loaded media is converted into a durable, glass-like or ceramic final waste form that strongly resists leaching.
The result is a smaller, more concentrated, and more stable final waste form — with less secondary waste generated along the way.
03 Why it matters
- Volume reduction: concentrating activity onto selective media avoids solidifying the entire liquid volume.
- Durability: a vitrified final form is among the most leach-resistant waste forms available.
- Fewer waste streams: capturing and immobilizing the media in one integrated process reduces the secondary waste that selective ion exchange normally leaves behind.
04 Patent family
This invention was filed in multiple jurisdictions. The granted U.S. patent below is the reference for this entry; related filings share the same disclosure.
| Jurisdiction | Number | Date |
|---|---|---|
| United States (granted) | US 9,437,336 B2 | Sept 6, 2016 |
| United States (application) | US 2011/0224472 A1 | Sept 15, 2011 |
| WIPO (PCT) | WO 2011/152909 | Dec 8, 2011 |
| Europe | EP 2556511 | Dec 8, 2011 |
| Canada | CA 2,792,512 · CA 2,986,337 | Dec 8, 2011 |
| India | IN 8315/DELNP/2012 | Mar 21, 2014 |
A related continuation, "Isotope-Specific Separation and Vitrification" (US 10,020,085 B2, 2018), extends the same line of work.
05 Official record
Patents are public documents. For the full specification, drawings, and legally operative claims:
06 Related technology
This invention underpins Fluid Tech's isotope-specific media and ion-exchange product lines: