US3575743A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making a phosphorus glass passivated transistor
Assignee: RCA Corp
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Filing: 1969-06-05
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Granted: 1971-04-20
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Expires: 1989-06-05
Abstract
Abstract PHOSPHOSILICATE GLASS IS INCORPORATED AS A STABILIZER IN THE PASSSIVATING OXIDE ON THE SURFACE OF A DIFFUSED PLANAR BIPOLAR TRANSISTOR BY (1) DRIVING IN A BASE DIFFUSION IN OXYGEN FOR A TIME LESS THAN THAT REQUIRED TO COMPLETE THE BASE DIFFFUSION, (2) DEPOSITING PHOSPHOSILICATE GLASS ON THE OXIDIZED SURFACE OF THE TRANSISTOR, (3) DEPOSITING A PROTECTIVE SILICON DIOXIDE COATING BY THE PYROLYSIS OF SILANE, SIH4, ON THE PHOSPHOSILICATE GLASS, AND THEN (4) DENSIFYING THE SILICON DIOXIDE COATING IN AN OXYGEN AMBIENT FOR A TIME SUFFICIENT TO COMPLETE THE BASE DRIVE-IN STEP.
Inventors
- 👤 Frank Peter Chiovarou
- 👤 Adolph Paul Storz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:48
CPC Classifications
H; H10; H10P; H10P95/00; H10P14/00; H10P14/60; H10P14/63; H10P14/6326; H10P14/6328; H10P14/6334; H10P14/65; H10P14/6516; H10P14/6548; H10P14/69; H10P14/692; H10P14/6921; H10P14/6922; H10P14/6923
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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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) | 1974-04-19 | 1974-10-19 | 1975-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-19 | 1978-10-19 | 1979-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-19 | 1982-10-19 | 1983-04-20 | $7700.00 | Window Closed / Lapsed |