US2855146A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic drum computer
Assignee: AT&T Inc
•
Filing: 1952-09-18
•
Granted: 1958-10-07
•
Expires: 1972-09-18
Abstract
No abstract record available.
Inventors
- 👤 Harley A Henning
- 👤 Orlando J Murphy
- 👤 Herbert M Teager
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:23
CPC Classifications
G; G06; G06F; G06F9/00; G06F9/04; G11; G11B; G11B5/00; G11B5/02
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2540654A
Cited
US2609143A
Cited
US2564403A
Cited
US2549071A
Cited
US2609439A
Cited
US2614169A
Cited
US2700148A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-10-06 | 1962-04-07 | 1962-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-06 | 1966-04-07 | 1966-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-06 | 1970-04-07 | 1970-10-07 | $7700.00 | Window Closed / Lapsed |