Patent US4029729A successfully refreshed from Google Patents.
Patent US3508205A successfully refreshed from Google Patents.
US3508205A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Communications security system
Assignee: Computer Usage Co Inc
•
Filing: 1967-01-17
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Granted: 1970-04-21
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Expires: 1987-01-17
Abstract
No abstract record available.
Inventors
- 👤 Elmer C Kubie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:07
CPC Classifications
G; G06; G06F; G06F21/00; G06F21/70; G06F21/78; G06F21/79; G06F21/10; G06F9/00; G06F9/06; G06F9/44; G06F9/448; G06F9/4482; G06F9/4484
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2883106A
Cited
US3108257A
Cited
US3245045A
Cited
US3264615A
Cited
US3271744A
Cited
US3328768A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-04-20 | 1973-10-20 | 1974-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-04-20 | 1977-10-20 | 1978-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-04-20 | 1981-10-20 | 1982-04-21 | $7700.00 | Window Closed / Lapsed |