US2849296A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Etching composition and method
Assignee: Lanteris Space LLC
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Filing: 1956-01-23
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Granted: 1958-08-26
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Expires: 1976-01-23
Abstract
No abstract record available.
Inventors
- 👤 Anthony J Certa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:18
CPC Classifications
C; C09; C09K; C09K13/00; C09K13/04; C09K13/08; H; H10; H10P; H10P95/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
59 words
A METHOD OF ETHCHING A BODY OF SEMICONDUCTIVE MATERIAL, COMPRISING IMMERSING SAID BODY IN AN ETCHANT SUBSTANTIALLY FREE OF BROMINE AND CONSISTING ESSENTIALLY OF ABOUT 19 TO 21 PARTS BY VOLUME OF GLACIAL 99.8% ACETIC ACID, 14 TO 16 PARTS BY VOLUME OF 70% NITRIC ACID, 9 TO 11 PARTS BY VOLUME OF 48% HYDROFLUORIC ACID AND 2 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) | 1961-08-25 | 1962-02-24 | 1962-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-08-25 | 1966-02-24 | 1966-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-08-25 | 1970-02-24 | 1970-08-26 | $7700.00 | Window Closed / Lapsed |