Patent US4197378A successfully refreshed from Google Patents.
US3082136A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Semiconductor devices and method of manufacturing them
Assignee: Sarkes Tarzian Inc
•
Filing: 1960-01-21
•
Granted: 1963-03-19
•
Expires: 1980-01-21
Abstract
No abstract record available.
Inventors
- 👤 Jr George B Finn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:08
CPC Classifications
H; H10; H10W; H10W74/00; H10W74/10; H10W74/131; H10D; H10D99/00; H10P; H10P95/00; H10W99/00; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12528; Y10T428/12674; Y10T428/12736; Y10T428/26; Y10T428/263; Y10T428/264
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
65 words
A METHOD OF ETCHING A SILICON RECTIFIER WHICH COMPRISES CONTACTING SAID RECTIFIER WITH A SOLUTION OF AN ALKALI METAL HYDROXIDE OF ABOUT 10% CONCENTRATION AT A TEMPERATURE NOT IN EXCESS OF THE BOILING POINT OF THE SOLUTION FOR ABOUT 10 MINUTES, RINSING THE RECTIFIER WITH WATER, THEN CONTACTING SAID RECTIFIER WITH AN AQUEOUS SOLUTION OF NITRIC ACID OF CONCENTRATION IN THE RANGE OF 1% TO
Claim 2
Independent Claim
65 words
A METHOD OF ETCHING A SILICON RECTIFIER WHICH COMPRISES CONTACTING SAID RECTIFIER WITH A SOLUTION OF AN ALKALI METAL HYDROXIDE OF ABOUT 10% CONCENTRATION AT A TEMPERATURE NOT IN EXCESS OF THE BOILING POINT OF THE SOLUTION FOR ABOUT 10 MINUTES, RINSING THE RECTIFIER WITH WATER, THEN CONTACTING SAID RECTIFIER WITH AN AQUEOUS SOLUTION OF NITRIC ACID OF CONCENTRATION IN THE RANGE OF 1% TO
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) | 1966-03-18 | 1966-09-17 | 1967-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-03-18 | 1970-09-17 | 1971-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-03-18 | 1974-09-17 | 1975-03-19 | $7700.00 | Window Closed / Lapsed |