US3374470A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adaptive threshold circuits
Assignee: International Business Machines Corp
•
Filing: 1965-10-19
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Granted: 1968-03-19
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Expires: 1985-10-19
Abstract
No abstract record available.
Inventors
- 👤 William S Rohland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:21
CPC Classifications
G; G06; G06F; G06F7/00; G06F7/02; G06F7/023
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
65 words
IN AN ADAPTIVE THRESHOLD CIRCUIT, A MULTI-CHANNEL READ HEAD, UPPER AND LOWER THRESHOLD CIRCUITS CONNECTED TO EACH CHANNEL, CIRCUIT MEANS COMMON TO ALL OF SAID READ HEAD CHANNELS FOR PRODUCING A READ SIGNAL, ADDITIONAL CIRCUIT MEANS CONNECTED TO SAID CIRCUIT MEANS FOR ESTABLISHING MINIMUM MARK AND MAXIMUM ERASURE SIGNAL LEVELS, AND MEANS CONNECTING SAID ADDITIONAL CIRCUIT MEANS TO CONTROL THE UPPER AND LOWER THRESHOLD CIRCUITS.
Claim 2
Dependent Claim
65 words
IN AN ADAPTIVE THRESHOLD CIRCUIT, A MULTI-CHANNEL READ HEAD, UPPER AND LOWER THRESHOLD CIRCUITS CONNECTED TO EACH CHANNEL, CIRCUIT MEANS COMMON TO ALL OF SAID READ HEAD CHANNELS FOR PRODUCING A READ SIGNAL, ADDITIONAL CIRCUIT MEANS CONNECTED TO SAID CIRCUIT MEANS FOR ESTABLISHING MINIMUM MARK AND MAXIMUM ERASURE SIGNAL LEVELS, AND MEANS CONNECTING SAID ADDITIONAL CIRCUIT MEANS TO CONTROL THE UPPER AND LOWER THRESHOLD CIRCUITS.
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) | 1971-03-19 | 1971-09-18 | 1972-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-03-19 | 1975-09-18 | 1976-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-03-19 | 1979-09-18 | 1980-03-19 | $7700.00 | Window Closed / Lapsed |