US3078448A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual-channel sensing
Assignee: International Business Machines Corp
•
Filing: 1957-07-15
•
Granted: 1963-02-19
•
Expires: 1977-07-15
Abstract
No abstract record available.
Inventors
- 👤 Hugh A O'brien
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:17
CPC Classifications
G; G11; G11B; G11B20/00; G11B20/10; G11B20/18; G11B20/1803; G11B5/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
168 words
APPARATUS FOR CHECKING INFORMATION STORED IN A MULTI-TRACK STORAGE MEDIUM COMPRISING MEANS TO READ A SINGLE VERSION OF THE INFORMATION OUT OF A SINGLE TRACK OF SAID STORAGE MEDIUM, MEANS RESPONSIVE TO SAID READ OUT MEANS FOR SIMULTANEOUSLY PRODUCING A FIRST AND SECOND VERSION OF THE SINGLE VERSION OF INFORMATION READ OUT OF SAID STORAGE MEDIUM, A FIRST INFORMATION CHANNEL, A SECOND INFORMATION CHANNEL, MEANS FOR TRANSMITTING THE FIRST VERSION OF THE INFORMATION THROUGH SAID FIRST INFORMATION CHANNEL, MEANS FOR TRANSMITTING SAID SECOND VERSION OF THE INFORMATION THROUGH SAID SECOND INFORMATION CHANNEL, A COMPARISON MEANS, MEANS FOR TRANSFERRING THE FIRST VERSION OF THE INFORMATION FROM SAID FIRST INFORMATION CHANNEL TO SAID COMPARISON MEANS, MEANS FOR TRANSFERRING THE SECOND VERSION OF THE INFORMATION FROM SAID SECOND INFORMATION CHANNEL TO SAID COMPARISON MEANS, AND MEANS OPERATIVE UNDER CONTROL OF SAID COMPARISON MEANS FOR PRODUCING AN INDICATION IF A DIFFERENCE IS DETECTED BETWEEN THE FIRST AND SECOND VERSION OF THE SINGLE VERSION OF THE INFORMATION READ OUT OF SAID STORAGE MEDIUM.
Claim 2
Dependent Claim
168 words
APPARATUS FOR CHECKING INFORMATION STORED IN A MULTI-TRACK STORAGE MEDIUM COMPRISING MEANS TO READ A SINGLE VERSION OF THE INFORMATION OUT OF A SINGLE TRACK OF SAID STORAGE MEDIUM, MEANS RESPONSIVE TO SAID READ OUT MEANS FOR SIMULTANEOUSLY PRODUCING A FIRST AND SECOND VERSION OF THE SINGLE VERSION OF INFORMATION READ OUT OF SAID STORAGE MEDIUM, A FIRST INFORMATION CHANNEL, A SECOND INFORMATION CHANNEL, MEANS FOR TRANSMITTING THE FIRST VERSION OF THE INFORMATION THROUGH SAID FIRST INFORMATION CHANNEL, MEANS FOR TRANSMITTING SAID SECOND VERSION OF THE INFORMATION THROUGH SAID SECOND INFORMATION CHANNEL, A COMPARISON MEANS, MEANS FOR TRANSFERRING THE FIRST VERSION OF THE INFORMATION FROM SAID FIRST INFORMATION CHANNEL TO SAID COMPARISON MEANS, MEANS FOR TRANSFERRING THE SECOND VERSION OF THE INFORMATION FROM SAID SECOND INFORMATION CHANNEL TO SAID COMPARISON MEANS, AND MEANS OPERATIVE UNDER CONTROL OF SAID COMPARISON MEANS FOR PRODUCING AN INDICATION IF A DIFFERENCE IS DETECTED BETWEEN THE FIRST AND SECOND VERSION OF THE SINGLE VERSION OF THE INFORMATION READ OUT OF SAID STORAGE MEDIUM.
References Cited (Backward Citations)
US2807005A
Cited
US2706215A
Cited
US2700148A
Cited
US2628346A
Cited
US2700755A
Cited
US2802940A
Cited
US2702380A
Cited
US2939110A
Cited
US2824222A
Cited
US2897480A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-02-18 | 1966-08-20 | 1967-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-02-18 | 1970-08-20 | 1971-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-02-18 | 1974-08-20 | 1975-02-19 | $7700.00 | Window Closed / Lapsed |