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Patent US3566544A successfully refreshed from Google Patents.
US3566544A
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US
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Optical surface generating method and apparatus
Assignee: Northrop Grumman Guidance and Electronics Co Inc
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Filing: 1968-04-25
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Granted: 1971-03-02
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Expires: 1988-04-25
Abstract
Abstract A SURFACE GENERATING SYSTEM WHEREIN AN OPTICAL LAP IS MOVED OVER THE SURFACE OF AN OPTICAL BLANK IN A PATH HAVING BOTH CIRCUMFERENTIAL AND OSCILLATING RADIAL COMPONENTS. CONTINUOUS AND SELECTIVE VARIATIONS IN THE AMPLI- TUDE OF THE RADIAL COMPONENT PRODUCES A DESIRED RADIALLY SYMMETRICAL CONTOUR ON THE WORK SURFACE.
Inventors
- 👤 Ronald Aspden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:32
CPC Classifications
B; B24; B24B; B24B13/00
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) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |