US3487369A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic calculator
Assignee: Northrop Grumman Information Technology Inc
•
Filing: 1966-08-12
•
Granted: 1969-12-30
•
Expires: 1986-08-12
Abstract
No abstract record available.
Inventors
- 👤 Claude F King
- 👤 Norman M Martin
- 👤 Robert N Mellott
- 👤 Ramon E Wolfe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:41
CPC Classifications
G; G06; G06F; G06F3/00; G06F3/14; G06F3/153; G06F15/00; G06F15/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2920312A
Cited
US3108257A
Cited
USRE25599E
Cited
US3187321A
Cited
US3302179A
Cited
US3293614A
Cited
US3351929A
Cited
US3355714A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-12-29 | 1973-06-30 | 1973-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-12-29 | 1977-06-30 | 1977-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-12-29 | 1981-06-30 | 1981-12-30 | $7700.00 | Window Closed / Lapsed |