Patent US3003900A successfully refreshed from Google Patents.
US3003900A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for diffusing active impurities into semiconductor materials
Assignee: Pacific Semiconductors Inc
•
Filing: 1957-11-12
•
Granted: 1961-10-10
•
Expires: 1977-11-12
Abstract
No abstract record available.
Inventors
- 👤 Clifford A Levi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:39
CPC Classifications
H; H10; H10P; H10P95/00; C; C30; C30B; C30B29/00; C30B29/02; C30B29/08; C30B31/00; C30B31/06; C30B31/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
99 words
IN A SEMICONDUCTOR CRYSTAL BODY THE METHOD OF REDUCING THE CONENTRATION OF A RAPIDLY DIFFUSING ACCEPTOR IMPURITY WHICH AFFECTS THE ELECTRICAL CHARACTERISTICS OF SAID BODY INCLUDING THE STEPS OF: PLACING A BODY OF SEMICONDUCTOR MATERIAL TOGETHER WITH A SOURCE OF HALOGEN ATOMS INTO A FIRST PORTION OF A SEALED CONTAINER, PLACING A SOLID METALLIC SINK INTO A SECOND PORTION OF SAID CONTAINER, AND HEATING SAID CONTAINER TO AT LEAST THE DIFFUSION TEMPERATURE OF SAID RAPIDLY DIFFUSING ACCEPTOR IMPURITY, SAID TEMPERATURE BEING GREATER THAN THE MELTING POINT OF SAID METALLIC SINK, BUT BELOW THE MELTING POINT OF SAID SEMICONDUCTOR MATERIAL.
Claim 2
Dependent Claim
99 words
IN A SEMICONDUCTOR CRYSTAL BODY THE METHOD OF REDUCING THE CONENTRATION OF A RAPIDLY DIFFUSING ACCEPTOR IMPURITY WHICH AFFECTS THE ELECTRICAL CHARACTERISTICS OF SAID BODY INCLUDING THE STEPS OF: PLACING A BODY OF SEMICONDUCTOR MATERIAL TOGETHER WITH A SOURCE OF HALOGEN ATOMS INTO A FIRST PORTION OF A SEALED CONTAINER, PLACING A SOLID METALLIC SINK INTO A SECOND PORTION OF SAID CONTAINER, AND HEATING SAID CONTAINER TO AT LEAST THE DIFFUSION TEMPERATURE OF SAID RAPIDLY DIFFUSING ACCEPTOR IMPURITY, SAID TEMPERATURE BEING GREATER THAN THE MELTING POINT OF SAID METALLIC SINK, BUT BELOW THE MELTING POINT OF SAID SEMICONDUCTOR MATERIAL.
References Cited (Backward Citations)
US843563A
Cited
US1086019A
Cited
US1211635A
Cited
US1968442A
Cited
US2552626A
Cited
US2685728A
Cited
GB690243A
Cited
US2692839A
Cited
US2844460A
Cited
US2849343A
Cited
US2834697A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-10-09 | 1965-04-10 | 1965-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-10-09 | 1969-04-10 | 1969-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-10-09 | 1973-04-10 | 1973-10-10 | $7700.00 | Window Closed / Lapsed |