US3378820A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Data communication system
Assignee: Digital Equipment Corp
•
Filing: 1964-08-13
•
Granted: 1968-04-16
•
Expires: 1984-08-13
Abstract
No abstract record available.
Inventors
- 👤 Donald L Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:07
CPC Classifications
H; H04; H04L; H04L5/00; G; G06; G06F; G06F13/00; G06F13/14; G06F13/20; G06F13/22; H04L25/00; H04L25/02; H04L25/05
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2242196A
Cited
US2910238A
Cited
US3063036A
Cited
US3222647A
Cited
US3215987A
Cited
US3297996A
Cited
US3312945A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-04-16 | 1971-10-16 | 1972-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-16 | 1975-10-16 | 1976-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-16 | 1979-10-16 | 1980-04-16 | $7700.00 | Window Closed / Lapsed |