US2885273A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of etching metallic materials
Assignee: North American Aviation Corp
•
Filing: 1956-03-14
•
Granted: 1959-05-05
•
Expires: 1976-03-14
Abstract
No abstract record available.
Inventors
- 👤 Paul A Oelgoetz
- 👤 Le Roy P Streett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:17
CPC Classifications
C; C23; C23F; C23F1/00; C23F1/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
125 words
IN A METHOD OF ACID ETCHING MFATERIAL FROM DEMASKED SURFACE PORTIONS OF AN ALUMINIUM PART TO PROVIDE THAT PART WITH AN ETCHED AREA HAVING A WELL-DEFINED EDGE PORTION, THE MASKED STEPS OF: FORMING AN AMORPHOUS, MIXED METALLIC OXIDE SURFACE COATING INTERGRAL WITH SAID ALUMINUM PART, FORMING A MASK ON SAID ALUMINUM PART BY PROVIDING A CONTINOUS, STRIPPABLE, ACID-RESISTANT ORGANIC COATING IN ADHERING RELATION TO SAID OXIDE COATING, AND SUBSEQUENTLY STRIPPING AN EDGE-DEFINED PORTION OF SAID MASK THEREFORM, SAID AMORPHOUS, MIXED METTALIC OXIDE SURFACE COATING BEING FORMED BY TIME-EXTENDED CONTACT BETWEEN PRE-CLEANED DEOXIDEZ SURFACE PORTIONS OF SAID ALUMINUM PFART AND A SOLUTION CONTAINING DICHROMATE, PHOSPHATE, AND FLUORIDE IONS AND COMBINING WITH SAID ORGANIC COATING TO ESTABLISH SAID WELL-DEFINED EDGE PORTION DURING ACID ETCHING OF SAID PART.
Claim 2
Dependent Claim
125 words
IN A METHOD OF ACID ETCHING MFATERIAL FROM DEMASKED SURFACE PORTIONS OF AN ALUMINIUM PART TO PROVIDE THAT PART WITH AN ETCHED AREA HAVING A WELL-DEFINED EDGE PORTION, THE MASKED STEPS OF: FORMING AN AMORPHOUS, MIXED METALLIC OXIDE SURFACE COATING INTERGRAL WITH SAID ALUMINUM PART, FORMING A MASK ON SAID ALUMINUM PART BY PROVIDING A CONTINOUS, STRIPPABLE, ACID-RESISTANT ORGANIC COATING IN ADHERING RELATION TO SAID OXIDE COATING, AND SUBSEQUENTLY STRIPPING AN EDGE-DEFINED PORTION OF SAID MASK THEREFORM, SAID AMORPHOUS, MIXED METTALIC OXIDE SURFACE COATING BEING FORMED BY TIME-EXTENDED CONTACT BETWEEN PRE-CLEANED DEOXIDEZ SURFACE PORTIONS OF SAID ALUMINUM PFART AND A SOLUTION CONTAINING DICHROMATE, PHOSPHATE, AND FLUORIDE IONS AND COMBINING WITH SAID ORGANIC COATING TO ESTABLISH SAID WELL-DEFINED EDGE PORTION DURING ACID ETCHING OF SAID PART.
References Cited (Backward Citations)
US497982A
Cited
US2735763A
Cited
US2375613A
Cited
US2396685A
Cited
US2516685A
Cited
US2494910A
Cited
US2739047A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-05-04 | 1962-11-03 | 1963-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-05-04 | 1966-11-03 | 1967-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-05-04 | 1970-11-03 | 1971-05-05 | $7700.00 | Window Closed / Lapsed |