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US3469919A
Expired / Lapsed
US
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Electronic surveying instrument
Assignee: FLOYD L ZELLNER
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Filing: 1965-07-14
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Granted: 1969-09-30
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Expires: 1985-07-14
Abstract
No abstract record available.
Inventors
- 👤 Floyd L Zellner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:44
CPC Classifications
G; G01; G01C; G01C15/00; G01C15/002; G01C15/004; G01C15/006
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2796685A
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US2776357A
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US2916836A
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US3004162A
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US3168023A
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US3242340A
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US3266014A
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US3364356A
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US3279070A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-09-29 | 1973-03-31 | 1973-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-09-29 | 1977-03-31 | 1977-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-09-29 | 1981-03-31 | 1981-09-30 | $7700.00 | Window Closed / Lapsed |