US3993950A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carbon fiber electrometer for dosimeter
Assignee: Individual
•
Filing: 1975-06-06
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Granted: 1976-11-23
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Expires: 1995-06-06
Abstract
Abstract An electrometer for conventional pocket radiation dosimeters is disclosed in which the moving element of the electrometer is a carbon fiber. The fiber is spun from polyacrylonitrile homopolymer yarn and has a diameter of approximately 7 microns before carbonization. The polyacrylonitrile homopolymer fiber is conventionally preoxidized at approximately 270° C before conventional carbonization at approximately 1200° C. The resulting working fiber has a round cross sectional diameter of approximately 4 microns and a modulus of elasticity of approximately 15,000,000 psi. The fiber is mounted in a conventionally loop shaped electrometer frame by crimping the ends of the fiber into tabs on the frame.
Inventors
- 👤 Harley V. Piltingsrud
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:14
CPC Classifications
G; G01; G01R; G01R5/00; G01R5/28; G01R5/32; H; H01; H01J; H01J47/00; H01J47/02; H01J47/04
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
48 words
An electrometer for a dosimeter comprising: a. an electrically conductive electrometer frame having bendable tabs; b. an approximately seven micron polyacrylonitrile homopolymer yarn fiber carbonized to provide a flexible conductive carbon fiber; and c. the said carbon fiber attached to the said frame by the said bendable tabs.
Claim 2
Dependent Claim
48 words
An electrometer for a dosimeter comprising: a. an electrically conductive electrometer frame having bendable tabs; b. an approximately seven micron polyacrylonitrile homopolymer yarn fiber carbonized to provide a flexible conductive carbon fiber; and c. the said carbon fiber attached to the said frame by the said bendable tabs.
Claim 3
Dependent Claim
28 words
The electrometer as claimed in claim 1 wherein the said fiber has a diameter after carbonization of approximately four microns and an elasticity modulus of approximately 15,000,000 psi.
References Cited (Backward Citations)
US2793297A
Cited
US3671192A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-11-23 | 1980-05-24 | 1980-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-11-23 | 1984-05-24 | 1984-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-11-23 | 1988-05-24 | 1988-11-23 | $7700.00 | Window Closed / Lapsed |