Patent US238878A successfully refreshed from Google Patents.
Patent US3331760A successfully refreshed from Google Patents.
US3331760A
Expired / Lapsed
US
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Electrolytic milling
Assignee: General Dynamics Corp
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Filing: 1962-01-16
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Granted: 1967-07-18
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Expires: 1982-01-16
Abstract
No abstract record available.
Inventors
- 👤 Howard H Powell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:20
CPC Classifications
C; C25; C25F; C25F3/00; C25F3/02; C25F7/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
113 words
THE METHOD OF MILLING A PART COMPRISING THE STEPS OF MASKING THOSE PORTIONS OF THE PART WHERE MILLING IS UNDERSIRABLE; PLACING THE THUS MASKED PART IN AN ELECTROLYTIC SOLUTION ADAPTED FOR CHEMICAL ACTIVITY WITH THE UNMASKED MATERIAL OF THE PART, THE SOLUTION HAVING NO CHEMICAL REACTION WITH THE PART IN THE ABSENCE OF ELECTRIC CURRENT FLOW THERETHROUGH; APPLYING A POSITIVE D-C CURRENT THROUGH THE PART AND THE SOLUTION TO CREATE CHEMICAL REACTION THEREBETWEEN THE EFFECT MILLING OF THE PART; AND INTERRUPTING THE CURRENT FLOW AT FREQUENCY OF ABOUT 300 CYCLES PERSECOND, THEREBY CAUSING THE ELIMINATION OF LARGE OXYGEN BUBBLES WHICH CAUSE VOIDS, CURRENT INTERRUPTION AND SURFACE INSULATION FROM ELECTROLYTIC ACTION OF THE SOLUTION.
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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) | 1970-07-17 | 1971-01-16 | 1971-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-07-17 | 1975-01-16 | 1975-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-07-17 | 1979-01-16 | 1979-07-18 | $7700.00 | Window Closed / Lapsed |