US4980631A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for measuring the surface area of bodies
Assignee: Individual
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Filing: 1989-07-19
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Granted: 1990-12-25
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Expires: 2009-07-19
Abstract
Abstract A method for measuring the surface area of an electrically surface-conductive body comprises applying an a.c. voltage between the body and a corrosion-resistant opposite electrode, both being immersed in an electrically conductive solution having no corrosive influence upon the surface of the body. An electric capacity value for the body is obtained. The measured value is inserted in the function of a surface area and a similar measurement or value obtained using another body having a known surface area in a similar manner. If the body to be treated does not exhibit surface conductivity, the body may be coated on the surface with a conductive material.
Inventors
- 👤 Aisaburo Yagashita
- 👤 Takeo Oki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:14
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/22
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
114 words
A method for measuring the surface area of a body having an electrically conductive surface or a body coated on its surface with an electrically conductive material, comprising: applying an alternating current voltage of from about 200 Hz to 50 KHz, with the peak value being between about 1 mV and 100 mV, between said body and a corrosion-resistant opposite electrode which are immersed in an electrically conductive solution having no corrosiveness upon the surface of said body to obtain an electric capacity value, and substituting said value in a function of a surface area and an electric capacity value obtained using a reference body having a known surface area in a similar manner.
Claim 2
Independent Claim
114 words
A method for measuring the surface area of a body having an electrically conductive surface or a body coated on its surface with an electrically conductive material, comprising: applying an alternating current voltage of from about 200 Hz to 50 KHz, with the peak value being between about 1 mV and 100 mV, between said body and a corrosion-resistant opposite electrode which are immersed in an electrically conductive solution having no corrosiveness upon the surface of said body to obtain an electric capacity value, and substituting said value in a function of a surface area and an electric capacity value obtained using a reference body having a known surface area in a similar manner.
Claim 3
Dependent Claim
23 words
A method as defined by claim 1, wherein said body and the reference body have electrically conductive surfaces formed of the same material.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-12-24 | 1994-06-25 | 1994-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-12-24 | 1998-06-25 | 1998-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-12-24 | 2002-06-25 | 2002-12-25 | $7700.00 | Window Closed / Lapsed |