US3409343A
Expired / Lapsed
US
⏱️ 0.0 years remaining
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Assignee: Individual
•
Filing: 1965-10-23
•
Granted: 1968-11-05
•
Expires: 1985-10-23
Abstract
No abstract record available.
Inventors
- 👤 Zapp Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:44
CPC Classifications
G; G02; G02B; G02B23/00; G02B23/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US715793A
Cited
US835625A
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US1897608A
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US2169548A
Cited
US2277065A
Cited
US2481409A
Cited
US2537962A
Cited
US2704009A
Cited
US2808757A
Cited
GB858171A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-11-05 | 1972-05-06 | 1972-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-11-05 | 1976-05-06 | 1976-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-11-05 | 1980-05-06 | 1980-11-05 | $7700.00 | Window Closed / Lapsed |