Google Patents, 2026-10-04
Queries: inventor:"Bruce A Perreault" (page rendered empty to text extraction); inventor:Perreault (radioactive OR alpha OR plasma OR radon) (only an unrelated Gilead patent by Stephane Perreault extracted); patent page US7800286B2.
US7800286B2 page (https://patents.google.com/patent/US7800286B2/en) [web]: - Inventor Bruce Alan Perreault; assignee "Individual". Worldwide applications: 2007 US only (no foreign family found). App. US11/744,769 filed 2007-05-04; published US20080272680A1 2008-11-06; granted 2010-09-21. - CPC G21H1/04 "Cells using secondary emission induced by alpha radiation, beta radiation, or gamma radiation". - Legal events: maintenance fee reminder 2014-05-02; lapsed for non-payment 2014-09-21 (status "Expired - Fee Related"). Historical-record point: patent abandoned at the first (3.5-year) maintenance fee. - Cited by (11): US20100062288A1 (David Weber, priority 2005, "isotopic electron emission"); nine NASA patents by Sang H. Choi et al. (priority 2015-2019), e.g. US10269463B2 "Nuclear thermionic avalanche cells with thermoelectric (NTAC-TE) generator in tandem mode", US11037687B2 "Co-60 breeding reactor tandem with thermionic avalanche cell", US10985676B2 "High performance electric generators boosted by nuclear electron avalanche (NEA)", US11257604B2 "Multi-layered radio-isotope for enhanced photoelectron avalanche process", US11581104B2; US20220108814A1 (Robert W. Moses, 2020, "Surface flashover and material texturing for multiplying and collecting electrons for nuclear thermal avalanche cells"); CN113539542B (Rocket Force University of Engineering of PLA, 2021, "Radon gas enrichment type alpha ray nuclear battery"). - Similar documents include US2517120A (1950, collecting electrical energy of nuclear reactions), US2527945A (1950), US3483040A (1969), Linder et al. 1952 "The use of radioactive material for the generation of high voltage", Windle 1964 "Microwatt radioisotope energy converters", Kavetsky et al. 2002.
CN113539542B (https://patents.google.com/patent/CN113539542B/en) [web]: filed 2021-07-19, granted 2024-01-30, active; assignee Rocket Force University of Engineering of PLA. Abstract: a radon-gas enrichment layer (porous shell, core thinner than alpha range in air) absorbs naturally occurring radon in mine tunnels; alphas from radon decay enter a transduction layer that converts them to electricity (classified G21H1/12, radiation-to-light-to-photoelectric). Bears on claim 2: an independent institutional design that also uses ambient radon as the alpha source for a nuclear battery, cites Perreault, but converts via a different (photovoltaic) path. No power figures seen in the abstract. Bears on: priority 1 (no foreign family; lapse), priority 3 (NASA NTAC "electron avalanche" line and Chinese radon battery cite the patent).