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US3521943A
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Apparatus for generating aspheric reflecting surfaces useful for correcting spherical aberration
Assignee: HERMAN F KELDERMAN
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Filing: 1966-09-30
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Granted: 1970-07-28
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Expires: 1986-09-30
Abstract
No abstract record available.
Inventors
- 👤 Herman F Kelderman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:33
CPC Classifications
G; G02; G02B; G02B26/00; G02B26/08; G02B26/0816; G02B26/0825; G01; G01J; G01J3/00; G01J3/12; G02B27/00; G02B27/42; G02B27/4205; G02B27/4216; G02B5/00; G02B5/18; G02B5/1814; G02B5/1861
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-07-27 | 1974-01-26 | 1974-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-27 | 1978-01-26 | 1978-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-27 | 1982-01-26 | 1982-07-28 | $7700.00 | Window Closed / Lapsed |