US2988818A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Azimuth directional reference system
Assignee: International Business Machines Corp
•
Filing: 1954-01-06
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Granted: 1961-06-20
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Expires: 1974-01-06
Abstract
No abstract record available.
Inventors
- 👤 Robert W Madden
- 👤 John E Lundberg
- 👤 Frederic A Foss
- 👤 Henry T Marcy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 08:41
CPC Classifications
G; G01; G01C; G01C19/00; G01C19/02; G01C19/34; Y; Y10; Y10T; Y10T74/00; Y10T74/12; Y10T74/1229
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1612119A
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US2427158A
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US2573626A
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US2620441A
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US2614237A
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US2633029A
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US2902772A
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US2662301A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-19 | 1964-12-19 | 1965-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-19 | 1968-12-19 | 1969-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-19 | 1972-12-19 | 1973-06-20 | $7700.00 | Window Closed / Lapsed |