Patent US3377258A successfully refreshed from Google Patents.
US3377258A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anodic oxidation
Assignee: Westinghouse Electric Corp
•
Filing: 1965-03-02
•
Granted: 1968-04-09
•
Expires: 1985-03-02
Abstract
No abstract record available.
Inventors
- 👤 Paul F Schmidt
- 👤 Norbert J Roney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:53
CPC Classifications
C; C25; C25D; C25D11/00; C25D11/02; C25D11/32; H; H10; H10P; H10P14/00; H10P14/60; H10P14/63; H10P14/6302; H10P14/6304; H10P14/6306; H10P14/6308; H10P14/6309; H10P95/00; H10P14/6324
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
112 words
IN THE PROCESS FOR FORMING OXIDE COATINGS ON OPPOSITE SIDES OF AN N-TYPE SILICON WAFER, THE STEPS OF IMMERSING THE WAFER IN AN ELECTROLYTE CAPABLE OF FORMING AN ANODIC OXIDE LAYER THEREON, APPLYING AN ANODIZING POTENTIAL BETWEEN THE WAFER AND AN INERT ELECTRODE EXTENDING INTO THE ELECTROLYTE, AND SUBJECTING ONLY ONE SIDE OF THE WAFER TO A BEAM OF WHITE LIGHT CONTAINING NEAR INFRARED WAVELENGTHS WHEREBY THE SHORT WAVELENGTHS OF THE LIGHT BEAM WILL CAUSE THE FORMATION OF AN OXIDE FILM ON THE SIDE OF THE WAFER ON WHICH THE LIGHT BEAM IS INCIDENT WHILE THE LONGER WAVELENGTHS WILL PASS THROUGH THE WAFER TO FORM AN OXIDE COATING ON THE OPPOSITE SIDE.
Claim 2
Dependent Claim
112 words
IN THE PROCESS FOR FORMING OXIDE COATINGS ON OPPOSITE SIDES OF AN N-TYPE SILICON WAFER, THE STEPS OF IMMERSING THE WAFER IN AN ELECTROLYTE CAPABLE OF FORMING AN ANODIC OXIDE LAYER THEREON, APPLYING AN ANODIZING POTENTIAL BETWEEN THE WAFER AND AN INERT ELECTRODE EXTENDING INTO THE ELECTROLYTE, AND SUBJECTING ONLY ONE SIDE OF THE WAFER TO A BEAM OF WHITE LIGHT CONTAINING NEAR INFRARED WAVELENGTHS WHEREBY THE SHORT WAVELENGTHS OF THE LIGHT BEAM WILL CAUSE THE FORMATION OF AN OXIDE FILM ON THE SIDE OF THE WAFER ON WHICH THE LIGHT BEAM IS INCIDENT WHILE THE LONGER WAVELENGTHS WILL PASS THROUGH THE WAFER TO FORM AN OXIDE COATING ON THE OPPOSITE SIDE.
References Cited (Backward Citations)
US3010885A
Cited
US2909470A
Cited
US2995475A
Cited
US3324015A
Cited
US3345274A
Cited
US3345275A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-04-09 | 1971-10-09 | 1972-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-09 | 1975-10-09 | 1976-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-09 | 1979-10-09 | 1980-04-09 | $7700.00 | Window Closed / Lapsed |