US3589996A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical surface generating apparatus
Assignee: Northrop Grumman Guidance and Electronics Co Inc
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Filing: 1968-04-15
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Granted: 1971-06-29
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Expires: 1988-04-15
Abstract
Abstract A SURFACE GENERATING SYSTEM WHEREIN CONTINUOUS STREAMS OF ELECTROLYTE ARE CIRCULATED OVER PLATIUM ANODE AND CATHODE ELECTRODES AND ONTO THE WORK SURFACE OF AN OPTICAL BLANK. DURING MOVEMENT OVER THE WORK SURFACE, THE ELECTRODES ARE SELECTIVELY ENERIGIZED TO PRODUCE ELECTROPOLISHING THEREOF WITHOUT ADVERSE EFFECTS OF REACTION PLATING OR OTHER FACTORS THAT DEGRADE SURFACE QUALITY.
Inventors
- 👤 David Chu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:33
CPC Classifications
C; C25; C25F; 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) | 1974-06-28 | 1974-12-28 | 1975-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-28 | 1978-12-28 | 1979-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-28 | 1982-12-28 | 1983-06-29 | $7700.00 | Window Closed / Lapsed |