Patent US2249712A successfully refreshed from Google Patents.
US3065355A
Expired / Lapsed
US
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Marker sensing device
Assignee: Unisys Corp
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Filing: 1959-12-24
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Granted: 1962-11-20
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Expires: 1979-12-24
Abstract
No abstract record available.
Inventors
- 👤 Percy J Barnes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:45
CPC Classifications
G; G06; G06K; G06K13/00; G06K13/18; Y; Y10; Y10S; Y10S101/00; Y10S101/37
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1953072A
Cited
US2129847A
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US2143214A
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US2086554A
Cited
GB808096A
Cited
US2952416A
Cited
US2971716A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-11-19 | 1966-05-21 | 1966-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-11-19 | 1970-05-21 | 1970-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-11-19 | 1974-05-21 | 1974-11-20 | $7700.00 | Window Closed / Lapsed |