US3261733A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of dissolving a plug from a bimetallic metal core and etching bath
Assignee: Conversion Chemical Corp
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Filing: 1963-07-02
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Granted: 1966-07-19
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Expires: 1983-07-02
Abstract
No abstract record available.
Inventors
- 👤 Kenneth P Bellinger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:14
CPC Classifications
C; C23; C23F; C23F1/00; C23F1/10; C23F1/14; C23F1/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
159 words
THE METHOD OF FORMING METALS SUBSTANTIALLY INERT TO CONCENTRATED NITRIC ACID COMPRISING FORMING ABOUT A CORE OF A DISSOLVABLE METAL SELECTED FROM THE GROUP CONSISTING OF IRON, MOLYBDENUM AND COPPER A PRIMARY METAL SUBSTANTIALLY INERT TO NITRIC ACID TO PRODUCE AN INITIAL ASSEMBLY; AND IMMERSING SAID INITIAL ASSEMBLY IN A CORE-REMOVING BATH FOR A PERIOD OF TIME SUFFICIENT TO DISSOLVE SAID CORE, SAID BATH BEING AT TEMPERATURE OF ABOUT 140 TO 210* FAHRENHEIT AND COMPRISING AN AQUEOUS SOLUTION CONSISTING ESSENTIALLY OF ABOUT 15.0 TO 42.0 PERCENT BY WEIGHT NITRIC ACID, 2.0 TO 28.0 PERCENT BY WEIGHT OF A REACTIONCONTROLLING AGENT SELECTED FROM THE GROUP CONSISTING OF UREA AND MELAMINE, AND 40.0 TO 80.0 PERCENT BY WEIGHT WATER, SAID BATH HAVING A MOLAR RATIO OF REACTION-CONTROL LING AGENT TO NITRIC ACID OF 0.1 TO 0.75:1.0, THE IMMERSION OF SAID INITIAL ASSEMBLY IN SAID BATH PRODUCING A BLANKET OF FOAM ON THE TOP OF SAID BATH THROUGH WHICH FUMES MUST PASS.
Claim 2
Independent Claim
159 words
THE METHOD OF FORMING METALS SUBSTANTIALLY INERT TO CONCENTRATED NITRIC ACID COMPRISING FORMING ABOUT A CORE OF A DISSOLVABLE METAL SELECTED FROM THE GROUP CONSISTING OF IRON, MOLYBDENUM AND COPPER A PRIMARY METAL SUBSTANTIALLY INERT TO NITRIC ACID TO PRODUCE AN INITIAL ASSEMBLY; AND IMMERSING SAID INITIAL ASSEMBLY IN A CORE-REMOVING BATH FOR A PERIOD OF TIME SUFFICIENT TO DISSOLVE SAID CORE, SAID BATH BEING AT TEMPERATURE OF ABOUT 140 TO 210* FAHRENHEIT AND COMPRISING AN AQUEOUS SOLUTION CONSISTING ESSENTIALLY OF ABOUT 15.0 TO 42.0 PERCENT BY WEIGHT NITRIC ACID, 2.0 TO 28.0 PERCENT BY WEIGHT OF A REACTIONCONTROLLING AGENT SELECTED FROM THE GROUP CONSISTING OF UREA AND MELAMINE, AND 40.0 TO 80.0 PERCENT BY WEIGHT WATER, SAID BATH HAVING A MOLAR RATIO OF REACTION-CONTROL LING AGENT TO NITRIC ACID OF 0.1 TO 0.75:1.0, THE IMMERSION OF SAID INITIAL ASSEMBLY IN SAID BATH PRODUCING A BLANKET OF FOAM ON THE TOP OF SAID BATH THROUGH WHICH FUMES MUST PASS.
References Cited (Backward Citations)
US2177751A
Cited
US3192084A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-07-18 | 1970-01-17 | 1970-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-07-18 | 1974-01-17 | 1974-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-07-18 | 1978-01-17 | 1978-07-19 | $7700.00 | Window Closed / Lapsed |