Patent US3347720A successfully refreshed from Google Patents.
US3347720A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of forming a semiconductor by masking and diffusion
Assignee: Bendix Corp
•
Filing: 1965-10-21
•
Granted: 1967-10-17
•
Expires: 1985-10-21
Abstract
No abstract record available.
Inventors
- 👤 William S Bryan
- 👤 Gerald S Worchel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:25
CPC Classifications
H; H10; H10P; H10P95/00; H10D; H10D99/00; H10W; H10W15/00; H10W15/01; Y; Y10; Y10S; Y10S148/00; Y10S148/037; Y10S148/145
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
77 words
A METHOD OF MAKING A SEMICONDUCTOR DEVICE COMPRISING THE STEPS OF MASKING AND PROVIDING OPENINGS IN THE MASK ON A WAFER OF A PREDETERMINED TYPE OF CONDUCTIVITY, DIFFUSING IMPURITIES OF AN OPPOSITE TYPE CONDUCTIVITY IN PREDETERMINED LOCATIONS TO A PREDETERMINED DEPTH, A SECOND MASKING AND PROVIDING AN OPENING AND DIFFUSING AN ADDITIONAL AMOUNT OF SAID OPPOSITE TYPE IMPURITIES TO OVERLAP SAID FIRST DIFFUSION AND TO A DEPTH LESS THAN SAID FIRST DIFFUSION, AND A THIRD MASKING AND
Claim 2
Independent Claim
77 words
A METHOD OF MAKING A SEMICONDUCTOR DEVICE COMPRISING THE STEPS OF MASKING AND PROVIDING OPENINGS IN THE MASK ON A WAFER OF A PREDETERMINED TYPE OF CONDUCTIVITY, DIFFUSING IMPURITIES OF AN OPPOSITE TYPE CONDUCTIVITY IN PREDETERMINED LOCATIONS TO A PREDETERMINED DEPTH, A SECOND MASKING AND PROVIDING AN OPENING AND DIFFUSING AN ADDITIONAL AMOUNT OF SAID OPPOSITE TYPE IMPURITIES TO OVERLAP SAID FIRST DIFFUSION AND TO A DEPTH LESS THAN SAID FIRST DIFFUSION, AND A THIRD MASKING AND
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-10-16 | 1971-04-17 | 1971-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-16 | 1975-04-17 | 1975-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-16 | 1979-04-17 | 1979-10-17 | $7700.00 | Window Closed / Lapsed |