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US3442579A
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Apparatus for measuring and plotting the surface contour of the eye by the use of sonic compressional waves
Assignee: MICHAEL A FRIEDBERG
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Filing: 1965-11-29
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Granted: 1969-05-06
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Expires: 1985-11-29
Abstract
No abstract record available.
Inventors
- 👤 Michael A Friedberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:19
CPC Classifications
A; A61; A61B; A61B3/00; A61B3/10; A61B3/107; A61B8/00; A61B8/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2940305A
Cited
US3176263A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-05-05 | 1972-11-04 | 1973-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-05-05 | 1976-11-04 | 1977-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-05-05 | 1980-11-04 | 1981-05-06 | $7700.00 | Window Closed / Lapsed |