US3081383A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and means for variable resistance recording
Assignee: Individual
•
Filing: 1959-10-30
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Granted: 1963-03-12
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Expires: 1979-10-30
Abstract
No abstract record available.
Inventors
- 👤 Panayotis C Dimitracopoulos
- 👤 Constantine D Pezaris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:46
CPC Classifications
G; G11; G11B; G11B11/00; G11B11/16; G11B9/00; G11B9/04
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
119 words
AN INFORMATION-CARRYING RECORD DEVICE COMPRISING A LAYER OF ELECTRICALLY CONDUCTIVE MATERIAL, A LAYER OF RELATIVELY RESISTIVE MATERIAL DISPOSED ON AT LEAST ONE SURFACE OF SAID FIRST-NAMED LAYER, SAID SECOND-NAMED LAYER BEING INSCRIBED WITH SUBSTANTIALLY VERTICAL INTELLIGENCE UNDULATIONS ALONG A PREDETERMINED PATTERN, WHEREBY THE VERTICAL THICKNESS OF SAID SECOND-NAMED LAYER VARIES ALONG SAID PATTERN, PROVIDING VARIABLE RESISTIVITY PATHS THEREALONG BETWEEN SAID FIRST-NAMED LAYER AND THE SURFACE OF SAID SECOND-NAMED LAYER IN ACCORDANCE WITH THE AMPLITUDE OF THE UNDULATIONS, THE RESISTANCE OF SAID SECOND-NAMED LAYER WITH RESPECT TO SAID FIRST-NAMED LAYER AT ANY POINT BEING DIRECTLY PROPORTIONAL TO THE HEIGHT OF SAID SECOND-NAMED LAYER AT SAID POINT, AT LEAST ONE CONDUCTIVE STYLUS MECHANICALLY AND CONDUCTIVELY ENGAGEABLE WITH THE SURFACE OF SAID
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-03-11 | 1966-09-10 | 1967-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-03-11 | 1970-09-10 | 1971-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-03-11 | 1974-09-10 | 1975-03-12 | $7700.00 | Window Closed / Lapsed |