US2789364A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Elevation measuring instrument
Assignee: Individual
•
Filing: 1950-04-28
•
Granted: 1957-04-23
•
Expires: 1970-04-28
Abstract
No abstract record available.
Inventors
- 👤 Robert W Selleck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:25
CPC Classifications
G; G01; G01C; G01C5/00; G01C5/04; Y; Y10; Y10S; Y10S403/00; Y10S403/07; Y10T; Y10T137/00; Y10T137/7287; Y10T137/7339; Y10T137/7349
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US143907A
Cited
US277037A
Cited
US397294A
Cited
US547864A
Cited
US566698A
Cited
US653629A
Cited
US763241A
Cited
US762072A
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FR338880A
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US872183A
Cited
US909529A
Cited
US919934A
Cited
US1060602A
Cited
US1099490A
Cited
US1231162A
Cited
US1211718A
Cited
US1372431A
Cited
GB185806A
Cited
US1669183A
Cited
US1801513A
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US1914851A
Cited
DE620208C
Cited
US1970883A
Cited
US2371632A
Cited
US2389664A
Cited
US2438758A
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US2444767A
Cited
US2422960A
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US2419306A
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US2428346A
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US2566102A
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US2558004A
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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) | 1960-04-22 | 1960-10-22 | 1961-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-04-22 | 1964-10-22 | 1965-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-04-22 | 1968-10-22 | 1969-04-23 | $7700.00 | Window Closed / Lapsed |