US4996576A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radiation-sensitive device
Assignee: Nokia Bell Labs
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Filing: 1989-05-15
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Granted: 1991-02-26
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Expires: 2009-05-15
Abstract
Abstract A p-channel depletion-mode MOS device is utilized for measuring low levels of ionizing radiation.
Inventors
- 👤 William T. Lynch
- 👤 Lalita Manchanda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:46
CPC Classifications
H; H10; H10F; H10F30/00; H10F30/20; H10F30/29; H10F30/298
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
92 words
In combination, a p-channel depletion-mode MOS device adapted to be interposed in a path of non-particle ionizing radiation, and means for determining, for a given gate voltage applied to said device, the change in source-to-drain current that results from irradiation of said device with said non-particle ionizing radiation thereby to provide a measurement of the non-particle radiation dose to which said device was exposed wherein said device comprises a gate pattern including an insulating layer of said gate having a conductive gate layer thereon, said conductive gate layer comprising n + polysilicon.
Claim 2
Dependent Claim
92 words
In combination, a p-channel depletion-mode MOS device adapted to be interposed in a path of non-particle ionizing radiation, and means for determining, for a given gate voltage applied to said device, the change in source-to-drain current that results from irradiation of said device with said non-particle ionizing radiation thereby to provide a measurement of the non-particle radiation dose to which said device was exposed wherein said device comprises a gate pattern including an insulating layer of said gate having a conductive gate layer thereon, said conductive gate layer comprising n + polysilicon.
Claim 3
Dependent Claim
16 words
A combination as in claim 1 wherein said insulating layer of said gate comprises silicon dioxide.
Claim 4
Dependent Claim
15 words
A combination as in claim 1 wherein said insulting layer of said gate comprises SIPOS.
Claim 5
Dependent Claim
18 words
A combination as in claim 1 wherein said device comprises a gate pattern having a closed ring structure.
Claim 6
Independent Claim
79 words
A method of measuring non-particle ionized radiation dose, comprising the step of interposing a p-channel depletion-mode MOS device in the path of radiation whose dose is to be measured and for a given gate voltage measuring the change in drain current that occurs in said device as a result of being irradiated wherein said device comprises source and drain contacts and a gate pattern that includes an insulating layer of said gate having an n + polysilicon layer thereon.
Claim 7
Independent Claim
79 words
A method of measuring non-particle ionized radiation dose, comprising the step of interposing a p-channel depletion-mode MOS device in the path of radiation whose dose is to be measured and for a given gate voltage measuring the change in drain current that occurs in said device as a result of being irradiated wherein said device comprises source and drain contacts and a gate pattern that includes an insulating layer of said gate having an n + polysilicon layer thereon.
Claim 8
Dependent Claim
42 words
A method as in claim 5, wherein during the time that said device is exposed to radiation, an external positive bias voltage is connected to said n + polysilicon layer and an external negative bias voltage is applied to said drain contact.
Claim 9
Dependent Claim
26 words
A method as in claim 5 wherein during the time that said device is exposed to radiation, no external bias voltages are applied to said device.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-02-25 | 1994-08-27 | 1995-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-02-25 | 1998-08-27 | 1999-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-02-25 | 2002-08-27 | 2003-02-26 | $7700.00 | Window Closed / Lapsed |