Patent US3291667A successfully refreshed from Google Patents.
US3291667A
Expired / Lapsed
US
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Etching process for selectively forming workpiece surfaces
Assignee: North American Aviation Corp
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Filing: 1961-04-10
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Granted: 1966-12-13
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Expires: 1981-04-10
Abstract
No abstract record available.
Inventors
- 👤 Jr Samuel Young
- 👤 Jr Dominic C Mitchell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 05:20
CPC Classifications
C; C23; C23F; C23F1/00; C23F1/02; C23F1/04; Y; Y10; Y10T; Y10T82/00; Y10T82/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
93 words
A PROCESS FOR SELECTIVELY FORMING A SURFACE OF A WORKPIECE OF A MATERIAL DIFFICULT TO MACHINE COMPRISING THE STEPS OF SELECTIVELY DISTRIBUTING AN EASILY MACHINABLE COATING MATERIAL HAVING AN ETCH RATE IN AN ETCHANT COMPARABLE TO THE ETCH RATE OF SAID WORKPIECE IN SAID ETCHANT ONTO THE SURFACE OF SAID WORKPIECE, MACHINING A TOP SURFACE OF SAID COATING MATERIAL INTO A DESIRED CONFIGURATION AND ETCHING AWAY ALL OF SAID COATING MATERIAL AND A PORTION OF SAID WORKPIECE UNTIL SAID WORKPIECE COMPRISES A SURFACE CONFORMING TO THE FORMED TOP SURFACE OF SAID COATING MATERIAL.
Claim 2
Dependent Claim
93 words
A PROCESS FOR SELECTIVELY FORMING A SURFACE OF A WORKPIECE OF A MATERIAL DIFFICULT TO MACHINE COMPRISING THE STEPS OF SELECTIVELY DISTRIBUTING AN EASILY MACHINABLE COATING MATERIAL HAVING AN ETCH RATE IN AN ETCHANT COMPARABLE TO THE ETCH RATE OF SAID WORKPIECE IN SAID ETCHANT ONTO THE SURFACE OF SAID WORKPIECE, MACHINING A TOP SURFACE OF SAID COATING MATERIAL INTO A DESIRED CONFIGURATION AND ETCHING AWAY ALL OF SAID COATING MATERIAL AND A PORTION OF SAID WORKPIECE UNTIL SAID WORKPIECE COMPRISES A SURFACE CONFORMING TO THE FORMED TOP SURFACE OF SAID COATING MATERIAL.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-12-12 | 1970-06-13 | 1970-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-12 | 1974-06-13 | 1974-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-12 | 1978-06-13 | 1978-12-13 | $7700.00 | Window Closed / Lapsed |