US3487301A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Measurement of semiconductor resistivity profiles by measuring voltages,calculating apparent resistivities and applying correction factors
Assignee: International Business Machines Corp
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Filing: 1968-03-04
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Granted: 1969-12-30
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Expires: 1988-03-04
Abstract
No abstract record available.
Inventors
- 👤 Edward E Gardner
- 👤 Edward F Gorey
- 👤 Paul A Schumann Jr
- 👤 Tsu-Hsing Yeh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:12
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/041; G01R; G01R31/00; G01R31/26; G01R31/2644
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-12-29 | 1973-06-30 | 1973-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-12-29 | 1977-06-30 | 1977-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-12-29 | 1981-06-30 | 1981-12-30 | $7700.00 | Window Closed / Lapsed |