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Patent US3423528A successfully refreshed from Google Patents.
US3423528A
Expired / Lapsed
US
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Electrographic data sensing system
Assignee: International Business Machines Corp
•
Filing: 1965-03-03
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Granted: 1969-01-21
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Expires: 1985-03-03
Abstract
No abstract record available.
Inventors
- 👤 Robert D Bradshaw
- 👤 Hans H Jensen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:01
CPC Classifications
G; G06; G06F; G06F3/00; G06F3/01; G06F3/03; G06F3/041; G06F3/045
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2241544A
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US2565612A
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US2527835A
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US2583720A
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US2965715A
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US2925467A
Cited
US3102926A
Cited
US3106707A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-21 | 1972-07-22 | 1973-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-21 | 1976-07-22 | 1977-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-21 | 1980-07-22 | 1981-01-21 | $7700.00 | Window Closed / Lapsed |