US3356550A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chemical milling of aluminum alloys
Assignee: Boeing Co
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Filing: 1964-03-16
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Granted: 1967-12-05
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Expires: 1984-03-16
Abstract
No abstract record available.
Inventors
- 👤 Gerald L Stiffler
- 👤 John A Tershin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:11
CPC Classifications
C; C23; C23F; C23F1/00; C23F1/10; C23F1/14; C23F1/32; C23F1/36; C23F1/02; C23F1/04
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
44 words
A CHEMICAL MILLING PROCES FOR ALUMINUM AND ALUMINUM ALLOYS COMPRISING THE STEPS OF INITIALLY FREEING THE SURFACE OF THE ALLOY FROM FOREIGN SUBSTANCES, ATTACKING THE SURFACE OF THE ALLOY FOR 50% TO 80% OF THE DESIRED METAL REMOVAL WITH A SOLUTION SUBSTANTIALLY COMPRISED OF
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) | 1970-12-04 | 1971-06-05 | 1971-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-12-04 | 1975-06-05 | 1975-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-12-04 | 1979-06-05 | 1979-12-05 | $7700.00 | Window Closed / Lapsed |