US3824136A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Etching of aluminum fluidic devices
Assignee: United States Department of the Army
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Filing: 1972-10-06
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Granted: 1974-07-16
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Expires: 1992-10-06
Abstract
Abstract A METHOD FOR CHEMICAL MILLING OF THIN AUMINUM SHEETS, SUCH AS WAFERS FOR FLUIDIC CONTROL SYSTEMS, WHICH PRODUCES SMOOTHER CUTS AND MINIMIZES ROUGH EDGES AND UNDERCUTTING, UTILIZES AND AWUEOUS ETCHING SOLUTION OF ABOUT 8*-15* BAUME'' CONTAINING ABOUT 75-150 GRAMS FECL3 AND ABOUT 6.5-11.5 GRAM HCL PER LITER.
Inventors
- 👤 K Gilbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:50
CPC Classifications
C; C23; C23F; C23F1/00; C23F1/10; C23F1/14; C23F1/16; C23F1/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-15 | 1978-01-14 | 1978-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-15 | 1982-01-14 | 1982-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-15 | 1986-01-14 | 1986-07-16 | $7700.00 | Window Closed / Lapsed |