Patent US3298771A successfully refreshed from Google Patents.
US3298771A
Expired / Lapsed
US
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Stepped zone lenses for wide-angle oculars
Assignee: Jetru Inc
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Filing: 1965-10-18
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Granted: 1967-01-17
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Expires: 1985-10-18
Abstract
No abstract record available.
Inventors
- 👤 Jr Harvey L Ratliff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:34
CPC Classifications
G; G02; G02B; G02B25/00; G02B25/002; G02B25/004; G02B3/00; G02B3/02; G02B3/04
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) | 1970-01-16 | 1970-07-18 | 1971-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-16 | 1974-07-18 | 1975-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-16 | 1978-07-18 | 1979-01-17 | $7700.00 | Window Closed / Lapsed |