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Patent US3500439A successfully refreshed from Google Patents.
US3500439A
Expired / Lapsed
US
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Simulation of radio navigation equipment
Assignee: General Precision Systems Inc
•
Filing: 1968-05-01
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Granted: 1970-03-10
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Expires: 1988-05-01
Abstract
No abstract record available.
Inventors
- 👤 George E Minnich
- 👤 Lynn A Staples
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:37
CPC Classifications
G; G09; G09B; G09B9/00; G09B9/02; G09B9/08; G09B9/26; G06; G06G; G06G7/00; G06G7/48; G06G7/78
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USRE23627E
Cited
US2529468A
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US2612638A
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US2715782A
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US2809444A
Cited
US2947088A
Cited
US3299197A
Cited
US3358284A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-03-09 | 1973-09-08 | 1974-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-03-09 | 1977-09-08 | 1978-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-03-09 | 1981-09-08 | 1982-03-10 | $7700.00 | Window Closed / Lapsed |