Patent US3539999A successfully refreshed from Google Patents.
US3539999A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control unit for multiple graphic and alphanumeric displays
Assignee: International Business Machines Corp
•
Filing: 1967-08-08
•
Granted: 1970-11-10
•
Expires: 1987-08-08
Abstract
No abstract record available.
Inventors
- 👤 Russell Houldin
- 👤 Robert J Sippel
- 👤 James T Zahorsky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:12
CPC Classifications
G; G06; G06F; G06F3/00; G06F3/14; G06F3/153
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1973-11-09 | 1974-05-11 | 1974-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-09 | 1978-05-11 | 1978-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-09 | 1982-05-11 | 1982-11-10 | $7700.00 | Window Closed / Lapsed |