Invalidity dossier
US 7223979
Radiation dosimeter system
Current assignee: Aerospace Corp
Added 9/23/2026, 11:55:15 PM
Active provider: DeepSeek · deepseek-flash
Patent summary
Title, assignee, inventors, filing/issue dates, abstract, and a plain-language overview of the claims.
Patent Overview — US 7,223,979 B1
Title: Radiation dosimeter system
Assignee / Inventor(s): Original assignee Aerospace Corp (later assignment to The Aerospace Corporation). Inventors: William R. Crain, Jr.; Dan J. Mabry; John Bernard Blake; Norman Katz.
Key dates: Filing/priority 2006-01-30 (application US 11/342,998); granted 2007-05-29; anticipated expiration 2026-01-30; status listed as "Expired - Lifetime." Classifications include G01T1/026 (semiconductor dose-rate meters) and G01T7/00.
Purpose: The invention relates to radiation dosimeters, particularly devices and systems for measuring radiation exposure on spacecraft. Stated objects include detecting accumulated radiation from charge deposits above a threshold, including prethreshold accumulations for improved measurement, and providing a daisy-chained dosimeter system for monitoring exposure about a platform such as a craft.
Plain-language scope: The patent describes a dosimeter, preferably built as monolithic single-chip electronics, having a silicon junction detector (e.g., high-resistivity N-type ion-implanted diode, ~60,000 ohm-cm, ~250 µm thick, operable at low bias) whose absorbed particle energy is converted to charge. A pulse-processing chain (summer, amplifier, baseline hold, voltage-to-current converter, zero detector, pulse threshold detector, preintegrator with reset control, integration summer, summing integrator) produces a total dose level; a dose threshold comparator, one-shot, charge bleeder, logarithmic counter, and DAC yield an analog dose output over a wide dynamic range. Devices include an output switch and daisy-chain controller; multiple units (up to thirty-two cited) share token-in/out, identification, pass, and dose signals, autonomously circulating a readout token so a single interface reads dose and ID for each device—optionally with an internal temperature sensor similarly chained. The device can run from a single 5-volt rail compatible with spacecraft power and analog inputs.
Source: https://patents.google.com/patent/US7223979/en
What the excerpt does not establish: It does not supply full claim language, the complete specification, all figures, dependent-claim scope, or the text of cited prior-art references (e.g., the EPROM dosimeter U.S. patent number is truncated). It also does not establish enforcement, licensing, or legal status as anything more than a stated assumption.
Generated 10/1/2026, 9:32:13 PM
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Litigation summary
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PTAB challenges
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Assignment history
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Prior art
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Obviousness
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Extensions
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Derivative works
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