US3411999A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of etching refractory metal based materials uniformly along a surface
Assignee: Value Engineering Co
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Filing: 1965-12-10
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Granted: 1968-11-19
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Expires: 1985-12-10
Abstract
No abstract record available.
Inventors
- 👤 Harold P Weinberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:39
CPC Classifications
C; C23; C23F; C23F1/00; C25; C25F; C25F3/00; C25F3/02; C25F3/04; C25F3/08
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
109 words
A METHOD OF CHEMICALLY ETCHING AN ARTICLE OF REFRACTORY METALS, REFRACTORY METAL BASED ALLOYS AND CARBIDES TO REMOVE METAL AT SUBSTANTIALLY A UNIFORM RATE ALONG A SURFACE THEREOF, AND COMPRISING THE STEPS OF IMMERSING THE ARTICLE INTO A VOLUME OF AN ETCHANT, PROVIDING A BODY OF LIQUID TO SURROUND A SUBSTANTIAL PORTION OF SAID ETCHANT AND INTERPOSING A RIGID DIAPHRAGM BETWEEN SAID LIQUID AND SAID ETCHANT TO PREVENT CONTACT BETWEEN SAID LIQUID AND SAID ETCHANT, PRODUCING ULTRASONIC VIBRATIONS IN THE BODY OF LIQUID WITH SAID VIBRATIONS BEING TRANSMITTED THROUGH THE LIQUID AND DIAPHRAGM TO THE ETCHANT AND UNIFORMLY DISTRIBUTED WITHIN THE ETCHANT AROUND THE IMMERSED PORTION OF THE ARTICLE.
Claim 2
Independent Claim
109 words
A METHOD OF CHEMICALLY ETCHING AN ARTICLE OF REFRACTORY METALS, REFRACTORY METAL BASED ALLOYS AND CARBIDES TO REMOVE METAL AT SUBSTANTIALLY A UNIFORM RATE ALONG A SURFACE THEREOF, AND COMPRISING THE STEPS OF IMMERSING THE ARTICLE INTO A VOLUME OF AN ETCHANT, PROVIDING A BODY OF LIQUID TO SURROUND A SUBSTANTIAL PORTION OF SAID ETCHANT AND INTERPOSING A RIGID DIAPHRAGM BETWEEN SAID LIQUID AND SAID ETCHANT TO PREVENT CONTACT BETWEEN SAID LIQUID AND SAID ETCHANT, PRODUCING ULTRASONIC VIBRATIONS IN THE BODY OF LIQUID WITH SAID VIBRATIONS BEING TRANSMITTED THROUGH THE LIQUID AND DIAPHRAGM TO THE ETCHANT AND UNIFORMLY DISTRIBUTED WITHIN THE ETCHANT AROUND THE IMMERSED PORTION OF THE ARTICLE.
Claim 3
Independent Claim
52 words
A METHOD OF ELECTROCHEMICALLY ETCHING AN ARTICLE OF REFRACTORY METALS, REFRACTORY METAL BASED ALLOYS AND CARBIDES TO REMOVE METAL AT SUBSTANTIALLY A UNIFORM RATE ALONG A SURFACE THEREOF, AND COMPRISING THE STEPS OF PROVIDING A BODY OF LIQUID TO SURROUND A SUBSTANTIAL PORTION OF SAID ETCHANT AND INTERPOSING A RIGID DIAPHRAGM BETWEEN
Claim 4
Independent Claim
52 words
A METHOD OF ELECTROCHEMICALLY ETCHING AN ARTICLE OF REFRACTORY METALS, REFRACTORY METAL BASED ALLOYS AND CARBIDES TO REMOVE METAL AT SUBSTANTIALLY A UNIFORM RATE ALONG A SURFACE THEREOF, AND COMPRISING THE STEPS OF PROVIDING A BODY OF LIQUID TO SURROUND A SUBSTANTIAL PORTION OF SAID ETCHANT AND INTERPOSING A RIGID DIAPHRAGM BETWEEN
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) | 1971-11-19 | 1972-05-20 | 1972-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-11-19 | 1976-05-20 | 1976-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-11-19 | 1980-05-20 | 1980-11-19 | $7700.00 | Window Closed / Lapsed |