US3249478A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing a bimetallic structure by etching
Assignee: Chemical Milling International Corp
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Filing: 1961-07-26
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Granted: 1966-05-03
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Expires: 1981-07-26
Abstract
No abstract record available.
Inventors
- 👤 Brevik Elmer Lawrence
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:51
CPC Classifications
C; C23; C23F; C23F1/00; C23F1/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
140 words
THE METHOD FOR PRODUCTION OF METALLURGICALLYBONDED BIMETALLIC STRUCTURE "CONSISTING OF A SHEET OF HIGHER STRENGTH ALLOY METALLURGICALLY BONDED TO A SHEET OF LOWER STRENGTH ALLOY"; HAVING A PREDETERMINED DESIGN IN THE HIGHER STRENGTH METAL OR ALLOY OF THE BIMETALLIC STRUCTURE CONSISTING OF COATING A PIECE OF BIMETALLIC METAL WITH A RESIST IN A PREDETERMINED PATTERN ON THE HIGHER STRENGTH METAL OR ALLOY, EXPOSING THE PARTIALLY RESIST-COATED BIMETALLIC PIECE TO A CHEMICAL SOLUTION CAPABLE OF DISSOLVING THE HIGHER STRENGTH METAL OR METALLIC ALLOY EXPOSED TO THE CHEMICAL SOLUTION, ETCHING THE EXPOSED METAL FOR A PERIOD OF TIME SUFFICIENT FOR THE METAL IN THE AREAS DEFINED BY THE PRE-SELECTED DESIGN OF THE RESIST COATED AREAS TO BE ENTIRELY ETCHED AWAY EXPOSING THE LOWER STRENGTH METAL OF THE BIMETALLIC STRUCTURE, REMOVING THE BIMETALLIC STRUCTURE FROM THE CHEMICAL ETCHING SOLUTION, AND REMOVING THE RESIST.
Claim 2
Independent Claim
140 words
THE METHOD FOR PRODUCTION OF METALLURGICALLYBONDED BIMETALLIC STRUCTURE "CONSISTING OF A SHEET OF HIGHER STRENGTH ALLOY METALLURGICALLY BONDED TO A SHEET OF LOWER STRENGTH ALLOY"; HAVING A PREDETERMINED DESIGN IN THE HIGHER STRENGTH METAL OR ALLOY OF THE BIMETALLIC STRUCTURE CONSISTING OF COATING A PIECE OF BIMETALLIC METAL WITH A RESIST IN A PREDETERMINED PATTERN ON THE HIGHER STRENGTH METAL OR ALLOY, EXPOSING THE PARTIALLY RESIST-COATED BIMETALLIC PIECE TO A CHEMICAL SOLUTION CAPABLE OF DISSOLVING THE HIGHER STRENGTH METAL OR METALLIC ALLOY EXPOSED TO THE CHEMICAL SOLUTION, ETCHING THE EXPOSED METAL FOR A PERIOD OF TIME SUFFICIENT FOR THE METAL IN THE AREAS DEFINED BY THE PRE-SELECTED DESIGN OF THE RESIST COATED AREAS TO BE ENTIRELY ETCHED AWAY EXPOSING THE LOWER STRENGTH METAL OF THE BIMETALLIC STRUCTURE, REMOVING THE BIMETALLIC STRUCTURE FROM THE CHEMICAL ETCHING SOLUTION, AND REMOVING THE RESIST.
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) | 1969-05-02 | 1969-11-01 | 1970-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-02 | 1973-11-01 | 1974-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-02 | 1977-11-01 | 1978-05-03 | $7700.00 | Window Closed / Lapsed |