US2804405A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of silicon devices
Assignee: AT&T Inc
•
Filing: 1954-12-24
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Granted: 1957-08-27
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Expires: 1974-12-24
Abstract
No abstract record available.
Inventors
- 👤 Derick Lincoln
- 👤 Carl J Frosch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:47
CPC Classifications
H; H10; H10P; H10P32/00; H10P32/10; H10P32/14; H10P32/1408; H10P32/141; H10P32/17; H10P32/171; H10P95/00; Y; Y10; Y10S; Y10S148/00; Y10S148/043; Y10S148/118; Y10S148/151
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
117 words
IN THE MANUFACTURE OF A SEMICONDUCTIVE DEVICE THE STEPS OF EXPOSING FOR AT LEAST SEVERAL MINUTES A SEMICONDUCTIVE SILICON BODY AT A TEMPERATURE OF APPROXIMATELY 1200*C. TO AN ATMOSPHERE RICH IN PHOSPHOROUS IN ONE OF ITS OXIDATION STATES TO FORM A NON-POROUS PHOSPHOROUS FILM ON THE SURFACE OF SAID BODY, REMOVING THE PHOSPHOROUS FILM FROM SELECTED PORTIONS OF THE SURFACE OF SAID BODY, EXPOSING FOR AT LEAST SEVERAL MINUTES THE SILICON BODY AT A TEMPERATURE APPROXIMATELY 1200*C, TO AN ATMOSPHERE RICH IN BORON IN ONE OF ITS OXIDATION STATES TO FORM A BORON FILM ON SAID SELECTED PORTION OF THE SURFACE OF THE BODY, AND HEATING SAID BODY FOR FORMING PHOSPHORUS-DIFFUSEDD AND BORON-DIFFUSED LAYERS ON SAID BODY.
Claim 2
Dependent Claim
117 words
IN THE MANUFACTURE OF A SEMICONDUCTIVE DEVICE THE STEPS OF EXPOSING FOR AT LEAST SEVERAL MINUTES A SEMICONDUCTIVE SILICON BODY AT A TEMPERATURE OF APPROXIMATELY 1200*C. TO AN ATMOSPHERE RICH IN PHOSPHOROUS IN ONE OF ITS OXIDATION STATES TO FORM A NON-POROUS PHOSPHOROUS FILM ON THE SURFACE OF SAID BODY, REMOVING THE PHOSPHOROUS FILM FROM SELECTED PORTIONS OF THE SURFACE OF SAID BODY, EXPOSING FOR AT LEAST SEVERAL MINUTES THE SILICON BODY AT A TEMPERATURE APPROXIMATELY 1200*C, TO AN ATMOSPHERE RICH IN BORON IN ONE OF ITS OXIDATION STATES TO FORM A BORON FILM ON SAID SELECTED PORTION OF THE SURFACE OF THE BODY, AND HEATING SAID BODY FOR FORMING PHOSPHORUS-DIFFUSEDD AND BORON-DIFFUSED LAYERS ON SAID BODY.
References Cited (Backward Citations)
US2701326A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-08-26 | 1961-02-25 | 1961-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-26 | 1965-02-25 | 1965-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-26 | 1969-02-25 | 1969-08-27 | $7700.00 | Window Closed / Lapsed |