US3409523A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electroetching an aluminum plated semiconductor in a tetraalkylammonium hydroxide electrolyte
Assignee: AT&T Inc
•
Filing: 1966-03-10
•
Granted: 1968-11-05
•
Expires: 1986-03-10
Abstract
No abstract record available.
Inventors
- 👤 Victor C Garbarini
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:00
CPC Classifications
H; H10; H10W; H10W20/00; H10W20/40; C; C25; C25F; C25F3/00; C25F3/02; C25F3/04; C25F3/14; H10D; H10D99/00; H10P; H10P50/00; H10P50/60; H10P50/61; H10P50/613; H10P95/00; H10W74/00; H10W74/40; H10W74/43
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
56 words
THE METHOD OF ETCHING ALUMINUM PLATED ON SEMICONDUCTOR MATERIAL COMPRISING IMMERSING THE ALUMINUM PLATED MATERIAL IN AN AQUEOUS SOLUTION OF TETRAALKYLAMMONIUM HYDROXIDE DENOTED GENERIC EXPRESSION R4N+(OH)-, WHERE R IS SELECTED FROM THE SERIES CONSISTING OF ETHYL, METHYL, PROPYL AND BUTYL WITH A METAL CATHODE MEMBER AND BIASING SAID CATHODE NEGATIVELY WITH RESPECT TO THE ALUMINUM PLATING.
Claim 2
Independent Claim
56 words
THE METHOD OF ETCHING ALUMINUM PLATED ON SEMICONDUCTOR MATERIAL COMPRISING IMMERSING THE ALUMINUM PLATED MATERIAL IN AN AQUEOUS SOLUTION OF TETRAALKYLAMMONIUM HYDROXIDE DENOTED GENERIC EXPRESSION R4N+(OH)-, WHERE R IS SELECTED FROM THE SERIES CONSISTING OF ETHYL, METHYL, PROPYL AND BUTYL WITH A METAL CATHODE MEMBER AND BIASING SAID CATHODE NEGATIVELY WITH RESPECT TO THE ALUMINUM PLATING.
References Cited (Backward Citations)
US2849349A
Cited
US3160539A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-11-05 | 1972-05-06 | 1972-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-11-05 | 1976-05-06 | 1976-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-11-05 | 1980-05-06 | 1980-11-05 | $7700.00 | Window Closed / Lapsed |