US3535015A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual-capacity optical systems
Assignee: GEORGE J YEVICK
•
Filing: 1967-08-22
•
Granted: 1970-10-20
•
Expires: 1987-08-22
Abstract
No abstract record available.
Inventors
- 👤 George J Yevick
- 👤 Louis Gold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 21:28
CPC Classifications
G; G02; G02B; G02B21/00; G02B23/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US533325A
Cited
GB190427572A
Cited
US910344A
Cited
US1553211A
Cited
US3064526A
Cited
US3227035A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-10-19 | 1974-04-20 | 1974-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-10-19 | 1978-04-20 | 1978-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-10-19 | 1982-04-20 | 1982-10-20 | $7700.00 | Window Closed / Lapsed |