US3146429A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drum storage system
Assignee: International Business Machines Corp
•
Filing: 1961-06-30
•
Granted: 1964-08-25
•
Expires: 1981-06-30
Abstract
No abstract record available.
Inventors
- 👤 George J Laurer
- 👤 Carl D Southard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:51
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/004
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
77 words
A SYSTEM FOR STORING DATA COMPRISING, IN COMBINATION, A ROTATABLE DATA STORAGE DRUM HAVING TWO MARKER CHANNELS FOR REGISTERING MAGNETIC POSITION MARKERS AND A PLURALITY OF DATA-RECEIVING CHANNELS, A MAGNETIC READWRITE HEAD ASSOCIATED WITH EACH OF SAID CHANNELS, CIRCUIT MEANS FOR ENERGIZING EACH OF SAID MAGNETIC HEADS, THE MAGNETIC HEAD FOR EACH MARKER CHANNEL DEVELOPING A READ SIGNAL IN RESPONSE TO A PASSING MARKER, FIRST GATING MEANS FOR COUPLING THE READ SIGNAL FROM THE MAGNETIC HEAD OF
Claim 2
Independent Claim
77 words
A SYSTEM FOR STORING DATA COMPRISING, IN COMBINATION, A ROTATABLE DATA STORAGE DRUM HAVING TWO MARKER CHANNELS FOR REGISTERING MAGNETIC POSITION MARKERS AND A PLURALITY OF DATA-RECEIVING CHANNELS, A MAGNETIC READWRITE HEAD ASSOCIATED WITH EACH OF SAID CHANNELS, CIRCUIT MEANS FOR ENERGIZING EACH OF SAID MAGNETIC HEADS, THE MAGNETIC HEAD FOR EACH MARKER CHANNEL DEVELOPING A READ SIGNAL IN RESPONSE TO A PASSING MARKER, FIRST GATING MEANS FOR COUPLING THE READ SIGNAL FROM THE MAGNETIC HEAD OF
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) | 1967-08-25 | 1968-02-24 | 1968-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-08-25 | 1972-02-24 | 1972-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-08-25 | 1976-02-24 | 1976-08-25 | $7700.00 | Window Closed / Lapsed |