US3564776A
Expired / Lapsed
US
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Optical surface generating method and apparatus
Assignee: Northrop Grumman Guidance and Electronics Co Inc
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Filing: 1969-04-16
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Granted: 1971-02-23
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Expires: 1989-04-16
Abstract
Abstract A SURFACE MODIFYING METHOD WHEREIN AN OPTICAL LAP IS MOVED OVER THE WORK SURFACE OF AN OPTICAL BLANK IN A PATH HAVING A CIRCUMFERENTIAL COMPONENT AND AN OSCILLATING RADIAL COMPONENT CONTROLLED SO AS TO CHANGE DIRECTIONS WHEN THE LAP IS ADJACENT PREDETERMINED POSITIONS ON THE BLANK''S WORK SURFACE. CONTROL OF THE RADIAL COMPONENTS DIRECTION REVERSALS WITH RESPECT TO BOTH THE BLANK''S RADIUS AND CIRCUMFERENCE PERMITS GENERATION OF COMPLETELY SYMMETRICAL SURFACE CHANGES.
Inventors
- 👤 Ronald Aspden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:57
CPC Classifications
B; B24; B24B; B24B13/00; B24B49/00; B24B49/02
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) | 1974-02-22 | 1974-08-24 | 1975-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-22 | 1978-08-24 | 1979-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-22 | 1982-08-24 | 1983-02-23 | $7700.00 | Window Closed / Lapsed |