US3553691A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Long range position determination system
Assignee: Individual
•
Filing: 1969-08-14
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Granted: 1971-01-05
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Expires: 1989-08-14
Abstract
Abstract A SYSTEM FOR PERFORMING RADIO ENERGY TRIANGULATION RELATIVE TO TWO KNOWN POINTS TO MAINTAIN AN ACCURATE POSITION OF A THIRD POINT OR SURFACE BODY WHICH MAY BE LOCATED AT VARYING TRANSHORIZON DISTANCES FROM THE FIRST AND SECOND POINTS. THE SYSTEM MAY UTILIZE ELECTROMAGNETIC RADIATION IN THE MID-VHF RANGE WITH TRANSMISSION AND RECEPTION OVER DISTANCES WHICH ARE SEVERAL TIMES GREATER THAN THE USUAL LINE OF SIGNT RADIO ENERGY RENGES, SUCH CAPABILITY BEING ENABLED DUE TO THE DISCOVERY OF A UNIQUE ELECTROMAGNETIC WAVE PROPAGATION PHENOMERA.
Inventors
- 👤 James W Lassiter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 02:30
CPC Classifications
G; G01; G01S; G01S5/00; G01S5/02; G01S5/14; G01S13/00; G01S13/02; G01S13/06; G01S13/46
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |