Patent US3226255A successfully refreshed from Google Patents.
US3226255A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Masking method for semiconductor
Assignee: AT&T Inc
•
Filing: 1961-10-31
•
Granted: 1965-12-28
•
Expires: 1981-10-31
Abstract
No abstract record available.
Inventors
- 👤 Theodore A Cieniewicz
- 👤 Ira L Custman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:54
CPC Classifications
H; H10; H10P; H10P50/00; H10P50/69; H10P50/691; C; C23; C23F; C23F1/00; C23F1/02; H10P14/00; H10P14/60; H10P14/68; H10P14/683; H10P95/00; Y; Y10; Y10S; Y10S438/00; Y10S438/942
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
78 words
THE METHOD OF MASKING A RELATIVELY FLAT-SURFACED SEMICONDUCTIVE BODY WITH WAX TO ENABLE SELECTIVE ETCHING THEREOF, WHICH COMPRISES THE STEPS OF: (A) PLACING A MASK HAVING AN ARRAY OF APERTURES IN INTIMATE CONTACT WITH THE FLAT SURFACE OF THE BODY, EACH APERATURE DEFINING A REGION WHICH IS NOT TO BE ETCHED; (B) PLACING A WAX FILM, HAVING A PERIMETER AT LEAST COEXTENSIVE WITH THAT OF THE ARRAY OF APERTURES, OVER AND IN INTIMATE CONTACT WITH THE MASK; AND
Claim 2
Independent Claim
78 words
THE METHOD OF MASKING A RELATIVELY FLAT-SURFACED SEMICONDUCTIVE BODY WITH WAX TO ENABLE SELECTIVE ETCHING THEREOF, WHICH COMPRISES THE STEPS OF: (A) PLACING A MASK HAVING AN ARRAY OF APERTURES IN INTIMATE CONTACT WITH THE FLAT SURFACE OF THE BODY, EACH APERATURE DEFINING A REGION WHICH IS NOT TO BE ETCHED; (B) PLACING A WAX FILM, HAVING A PERIMETER AT LEAST COEXTENSIVE WITH THAT OF THE ARRAY OF APERTURES, OVER AND IN INTIMATE CONTACT WITH THE MASK; 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) | 1968-12-27 | 1969-06-28 | 1969-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-27 | 1973-06-28 | 1973-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-27 | 1977-06-28 | 1977-12-28 | $7700.00 | Window Closed / Lapsed |