US3055776A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Masking technique
Assignee: Pacific Semiconductors Inc
•
Filing: 1960-12-12
•
Granted: 1962-09-25
•
Expires: 1980-12-12
Abstract
No abstract record available.
Inventors
- 👤 Stevenson Alden
- 👤 Thomas C Hall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:30
CPC Classifications
H; H10; H10P; H10P14/00; H10P14/60; H10P14/69; H10P14/692; H10P14/6921; H10P14/6922; H10P14/63; H10P14/6326; H10P14/6328; H10P14/6334; H10P95/00; H10W; H10W74/00; H10W74/40; H10W74/47; Y; Y10; Y10S; Y10S148/00; Y10S148/043; Y10S148/106; Y10S148/118; Y10S438/00; Y10S438/942
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
98 words
THE METHOD OF MASKING A PREDETERMINED PORTION OF THE SURFACE OF A BODY OF SEMICONDUCTIVE MATERIAL FROM PENETRATION BY AN ACTIVE IMPURAITY AT THE DIFFUSION TEMPERATURE OF SAID IMPURITY, SAID METHOD INCLUDING THE STEPS OF: HEATING THE BODY TO BE MASKED AND A PHENYLMETHYLPOLYSILOXANE TO A VALUE OF TEMPERATURE IN THE RANGE FRAOM 70*C. TO 300*C. IN AN OXYGENATED ATMOSPHERE THEREBY TO DEPOSIT A COATING OF SIO2-XR2X (WHERE 0<X<1 AND R IS A MONOVALENT HYDROCARBON RESIDUE) UPON THE SURAFACE OF SAID BODY; AND REMOVING SAID COATING FROM ALL BUT SAID PREDETERMINED PORTION OF THE SURFACE OF SAID BODY.
References Cited (Backward Citations)
US2874076A
Cited
US2980560A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-09-24 | 1966-03-26 | 1966-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-09-24 | 1970-03-26 | 1970-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-09-24 | 1974-03-26 | 1974-09-25 | $7700.00 | Window Closed / Lapsed |