US3135942A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency-modulation echo-sounder
Assignee: National Research Development Corp UK
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Filing: 1960-05-11
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Granted: 1964-06-02
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Expires: 1980-05-11
Abstract
No abstract record available.
Inventors
- 👤 Tucker David Gordon
- 👤 Kay Leslie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:02
CPC Classifications
G; G01; G01S; G01S15/00; G01S15/02; G01S15/06; G01S15/08; G01S15/32; G01S15/34
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
91 words
APPARATUS FOR DETECTING THE PRESENCE OF FURTHER OBJECTS SEPARATE FROM AND WITHIN A GIVEN DISTANCE FROM A FIRST OBJECT COMPRISING MEANS FOR TRANSMITTING A FREQUENCYMODULATED EXPLORING SIGNAL, MEANS FOR DETECTING ECHO SIGNALS RECEIVED FROM SAID FIRST OBJECT AND SAID FURTHER OBJECTS, MEANS FOR HETERODYNING DETECTED ECHO SIGNALS FROM SAID FIRST OBJECT WITH DETECTED ECHO SIGNALS FROM SAID FURTHER OBJECTS TO PRODUCE A BEAT SIGNAL, AND MEANS FOR INDICATING THE PRESENCE OF A SAID BEAT SIGNAL, WHEREBY INFORMATION IS PROVIDED AS TO THE PRESENCE OF ANY FURTHER OBJECTS WITHIN SAID GIVEN DISTANCE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-06-02 | 1967-12-02 | 1968-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-02 | 1971-12-02 | 1972-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-02 | 1975-12-02 | 1976-06-02 | $7700.00 | Window Closed / Lapsed |