Patent US3290180A successfully refreshed from Google Patents.
US3290180A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of treating silicon and devices containing pn junctions
Assignee: Texas Instruments Inc
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Filing: 1965-04-05
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Granted: 1966-12-06
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Expires: 1985-04-05
Abstract
No abstract record available.
Inventors
- 👤 Stephen S Baird
- 👤 Clyde R Fuller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:45
CPC Classifications
H; H10; H10P; H10P70/00; H10P70/10; H10P70/15; H10P14/00; H10P14/60; H10P14/63; H10P14/6302; H10P14/6304; H10P14/6306; H10P14/6308; H10P14/6309; H10P14/6322; H10P14/65; H10P14/6502; H10P14/6508; H10W; H10W74/00; H10W74/40; H10W74/47; Y; Y10; Y10S; Y10S148/00; Y10S148/003; Y10S148/017; Y10S148/118; Y10S438/00; Y10S438/906
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
131 words
THE METHOD OF PREPARING A PROTECTED SILICON PN JUNCTION WHICH COMPRISES THE STEPS OF DEGREASING THE SILICON SLICE IN TRICHLOROETHYLENE, RINSING IT IN METHYL ALCOHOL AND WATER, BOILING IT FOR 20 MINUTES AT 100*C. IN NITRIC ACID, RINSING IT IN DEIONIZED WATER FOR 5 MINUTES, HEATING IT IN CONCENTRATED SULFURIC ACID AT 200*C. FOR 20 MINUTES AND RINSING IN DEIONIZED RUNNING WATER FOR 5 MINUTES, SOAKING IN HYDROFLUORIC ACID FOR 30 MINUTES AND RINSING IN WATER 5 MINUTES, BOILING IN DEIONIZED WATER TWICE FOR 15 MINUTES AND RINSING IN WATER 5 MINUTES, BOILING IN NITRIC ACID 30 MINUTES AND RINSING IN DEIONIZED RUNNING WATER FOR 30 MINUTES, OXIDIZING ABOUT FIVE AND ONEHALF HOURS IN STREAM AT ATMOSPHERIC PRESSURE AT 1200*C., DRYING IN HELIUM FOR ONE HOUR AND COOLING TO ROOM TEMPERATURE.
Claim 2
Independent Claim
131 words
THE METHOD OF PREPARING A PROTECTED SILICON PN JUNCTION WHICH COMPRISES THE STEPS OF DEGREASING THE SILICON SLICE IN TRICHLOROETHYLENE, RINSING IT IN METHYL ALCOHOL AND WATER, BOILING IT FOR 20 MINUTES AT 100*C. IN NITRIC ACID, RINSING IT IN DEIONIZED WATER FOR 5 MINUTES, HEATING IT IN CONCENTRATED SULFURIC ACID AT 200*C. FOR 20 MINUTES AND RINSING IN DEIONIZED RUNNING WATER FOR 5 MINUTES, SOAKING IN HYDROFLUORIC ACID FOR 30 MINUTES AND RINSING IN WATER 5 MINUTES, BOILING IN DEIONIZED WATER TWICE FOR 15 MINUTES AND RINSING IN WATER 5 MINUTES, BOILING IN NITRIC ACID 30 MINUTES AND RINSING IN DEIONIZED RUNNING WATER FOR 30 MINUTES, OXIDIZING ABOUT FIVE AND ONEHALF HOURS IN STREAM AT ATMOSPHERIC PRESSURE AT 1200*C., DRYING IN HELIUM FOR ONE HOUR AND COOLING TO ROOM TEMPERATURE.
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) | 1969-12-05 | 1970-06-06 | 1970-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-05 | 1974-06-06 | 1974-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-05 | 1978-06-06 | 1978-12-06 | $7700.00 | Window Closed / Lapsed |