US3181120A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for the automatic recognition of written or printed characters
Assignee: TDK Micronas GmbH
•
Filing: 1961-04-07
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Granted: 1965-04-27
•
Expires: 1981-04-07
Abstract
No abstract record available.
Inventors
- 👤 Arthur M Lieberman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 03:00
CPC Classifications
G; G06; G06V; G06V10/00; G06V10/10; G06V30/00; G06V30/10; G06V30/14; G06V30/144
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
85 words
A CHARACTER-RECOGNITION SYSTEM COMPRISING IN COMBINATION A SINGLE DISPLAY-TARGET OF RESISTIVE MATERIAL, MEANS FOR CREATING A CONSTANT POTENTIAL FIELD ACROSS A SURFACE OF SAID MATERIAL, MEANS FOR ALTERING THE PATTERN OF CONSTANCY OF SAID POTENTIAL FIELD WHEREIN SAID PATTERN IS ALTERED IN ACCORDANCE WITH AND INDICATIVE OF A CHARACTER TO BE RECOGNIZED, MEANS FOR DETECTING ALTERATIONS OF POTENTIAL GRADIENTS IN SAID ALTERED PATTERN OF CONSTANCY OF SAID POTENTIAL FIELD, AND MEANS COUPLED TO SAID DETECTING MEANS FOR EVALUATING SAID POTENTIAL GRADIENTS TO IDENTIFY SAID CHARACTER.
Claim 2
Dependent Claim
85 words
A CHARACTER-RECOGNITION SYSTEM COMPRISING IN COMBINATION A SINGLE DISPLAY-TARGET OF RESISTIVE MATERIAL, MEANS FOR CREATING A CONSTANT POTENTIAL FIELD ACROSS A SURFACE OF SAID MATERIAL, MEANS FOR ALTERING THE PATTERN OF CONSTANCY OF SAID POTENTIAL FIELD WHEREIN SAID PATTERN IS ALTERED IN ACCORDANCE WITH AND INDICATIVE OF A CHARACTER TO BE RECOGNIZED, MEANS FOR DETECTING ALTERATIONS OF POTENTIAL GRADIENTS IN SAID ALTERED PATTERN OF CONSTANCY OF SAID POTENTIAL FIELD, AND MEANS COUPLED TO SAID DETECTING MEANS FOR EVALUATING SAID POTENTIAL GRADIENTS TO IDENTIFY SAID CHARACTER.
References Cited (Backward Citations)
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Cited
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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) | 1968-04-26 | 1968-10-26 | 1969-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-04-26 | 1972-10-26 | 1973-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-04-26 | 1976-10-26 | 1977-04-27 | $7700.00 | Window Closed / Lapsed |