US3740324A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic wire electropolishing process improvement
Assignee: Raytheon Co
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Filing: 1971-01-29
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Granted: 1973-06-19
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Expires: 1991-01-29
Abstract
Abstract A PROCESS IS DISCLOSED FOR IMPROVING THE SURFACE FINISH QUALITY OF RELATIVELY SMALL DIAMETER MAGNETIC STORAGE WIRE PRODUCED BY DRAWING RELATIVELY LARGE DIAMETER RAW STOCK WIRE THROUGH SUCCESSIVE DIAMETER REDUCING DIES. AN IMPROVEMENT IN THE QUALITY OF THE WIRE I OBTAINED BY ELECTROPOLISHING THE WIRE TO REDUCE THE SIZE AND DENSITY OF SURFACE BLEMISHES WHICH OCCUR IN THE WIRE IN THE FORM OF SMAL HOLES AND CRACKS. APPROPRIATE ELECTROLYTE AND APPARATUS FOR PERFORMING THE ELECTROPOLISHING PROCESS IS ALSO DISCLOSED.
Inventors
- 👤 T Lesher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:21
CPC Classifications
C; C25; C25F; C25F3/00; C25F3/16; C25F7/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-18 | 1976-12-18 | 1977-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-18 | 1980-12-18 | 1981-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-18 | 1984-12-18 | 1985-06-19 | $7700.00 | Window Closed / Lapsed |