Patent US3753878A successfully refreshed from Google Patents.
US3753878A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of electrochemically machining titanium or titanium alloy workpieces
Assignee: SMS Elotherm GmbH
•
Filing: 1971-09-21
•
Granted: 1973-08-21
•
Expires: 1991-09-21
Abstract
Abstract A METHOD AND APPARATUS FOR ELECTROCHEMICALLY MACHINING WORKPIECES OF TITANIUM OR TITANIUM ALLOY WHICH HAVE NOT BEEN HITHERTO AMENABLE TO SUCH MACHINING BECAUSE OF THE ROUGH SURFACES WHICH RESULT. IT HAS BEEN FOUND THAT SUBSTAANTIALLY ELIMISATING THE RIPPLE IN THE RECTIFIED A.C. SIGNAL APPLIED TO THE WORKPIECE FOR MACHINING PRODUCES SATISFACTORY SMOOTH SURFACES ON TITANTIUM OR TITANIUM ALLOY WORKPIECES AND THIS CAN BE ACCOMPLISHED BY PASSING THE RECTIFIED SIGNAL THROUGH A LOW FREQUENCY FILTER CIRCUIT.
Inventors
- 👤 P Gosger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:22
CPC Classifications
B; B23; B23H; B23H3/00; B23H3/02
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1976-08-20 | 1977-02-19 | 1977-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-20 | 1981-02-19 | 1981-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-20 | 1985-02-19 | 1985-08-21 | $7700.00 | Window Closed / Lapsed |