Patent US5691936A successfully refreshed from Google Patents.
US5814722A
Expired / Lapsed
US
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System for measurement of peaks on surfaces
Assignee: Eastman Kodak Co
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Filing: 1997-01-17
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Granted: 1998-09-29
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Expires: 2017-01-17
Abstract
Abstract A method of characterizing the roughness of a surface comprises counting peaks on a surface using a sensor by locating direction changes above a minimum and searches for the next direction change and where three changes are found of a valley, peak and another valley, one peak is counted. A signal qualifies as a peak if its short leg is above the normal threshold.
Inventors
- 👤 Steven M. Pratt
- 👤 Edwin R. Olear
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:24
CPC Classifications
G; G01; G01B; G01B21/00; G01B21/30; G01B7/00; G01B7/34
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
93 words
A method of determining the characteristics of a surface of a material comprising sensing peaks in said surface and counting peaks wherein the short leg is above the height of a threshold window wherein when a direction change in amplitude is located, the size of the change is compared to the threshold and when these changes locate a peak leg, a valley and a peak leg, one peak is counted and the height of the larger of the two legs is recorded and this process is repeated along the entire set of data.
Claim 2
Independent Claim
93 words
A method of determining the characteristics of a surface of a material comprising sensing peaks in said surface and counting peaks wherein the short leg is above the height of a threshold window wherein when a direction change in amplitude is located, the size of the change is compared to the threshold and when these changes locate a peak leg, a valley and a peak leg, one peak is counted and the height of the larger of the two legs is recorded and this process is repeated along the entire set of data.
Claim 3
Dependent Claim
16 words
The method of claim 1 wherein the total number of peaks per unit length is determined.
References Cited (Backward Citations)
US3112642A
Cited
US3372578A
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US3544774A
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US3847730A
Cited
US4084324A
Cited
US4951497A
Cited
US5242831A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-09-28 | 2002-03-30 | 2002-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-09-28 | 2006-03-30 | 2006-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-09-28 | 2010-03-30 | 2010-09-29 | $7700.00 | Window Closed / Lapsed |