US3130403A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for use in distance measurement
Assignee: Svenska AB Gasaccumulator
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Filing: 1958-09-11
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Granted: 1964-04-21
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Expires: 1978-09-11
Abstract
No abstract record available.
Inventors
- 👤 Granqvist Carl-Erik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:18
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/74; G01S13/82; G01S13/84; H; H03; H03L; H03L7/00; H03L7/06; H03L7/08; H03L7/081; H03L7/0812
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
146 words
APPARATUS FOR USE IN DISTANCE MEASUREMENT BY MEANS OF ELECTROMAGNETIC WAVE SIGNALS, COMPRISING A RECEIVER FOR RECEIVING A PERIODIC SIGNAL OF PREDETERMINED NATURE, A TRANSMITTER FOR TRANSMITTING A PERIODIC SIGNAL OF THE SAME NATURE AS THE ONE RECEIVED, A PHASE MEASURING DEVICE FOR COMPARING THE PHASE OF THE TRANSMITTER SIGNAL WITH THAT OF THE RECEIVED SIGNAL, A PHASE CONTROL DEVICE, AND AUTOMATIC SWITCHING MEANS FOR CAUSING THE PHASE CONTROL DEVICE DURING PREDETERMINED INTERVALS TO RESPOND TO THE PHASE MEASURING DEVICE FOR CONTROLLING THE PHASE OF THE TRANSMITTER SIGNAL RELATIVE TO THAT OF THE RECEIVED SIGNAL, SAID PHASE CONTROL DEVICE HAVING A MEASURE OF INERTIA PROPORTIONED RELATIVE TO THE SWITCHING RATE OF SAID AUTOMATIC SWITCHING MEANS WHEREBY SAID PHASE CONTROL DEVICE MAINTAINS BETWEEN SAID PREDETERMINED INTERVALS A SUBSTANTIALLY CONSTANT RATE OF PHASE CHANGE, THEREBY TO COUNTERACT ANY FREQUENCY DIFFERENCE BETWEEN SAID RECEIVED AND SAID TRANSMITTED PERIODIC SIGNAL.
Claim 2
Dependent Claim
146 words
APPARATUS FOR USE IN DISTANCE MEASUREMENT BY MEANS OF ELECTROMAGNETIC WAVE SIGNALS, COMPRISING A RECEIVER FOR RECEIVING A PERIODIC SIGNAL OF PREDETERMINED NATURE, A TRANSMITTER FOR TRANSMITTING A PERIODIC SIGNAL OF THE SAME NATURE AS THE ONE RECEIVED, A PHASE MEASURING DEVICE FOR COMPARING THE PHASE OF THE TRANSMITTER SIGNAL WITH THAT OF THE RECEIVED SIGNAL, A PHASE CONTROL DEVICE, AND AUTOMATIC SWITCHING MEANS FOR CAUSING THE PHASE CONTROL DEVICE DURING PREDETERMINED INTERVALS TO RESPOND TO THE PHASE MEASURING DEVICE FOR CONTROLLING THE PHASE OF THE TRANSMITTER SIGNAL RELATIVE TO THAT OF THE RECEIVED SIGNAL, SAID PHASE CONTROL DEVICE HAVING A MEASURE OF INERTIA PROPORTIONED RELATIVE TO THE SWITCHING RATE OF SAID AUTOMATIC SWITCHING MEANS WHEREBY SAID PHASE CONTROL DEVICE MAINTAINS BETWEEN SAID PREDETERMINED INTERVALS A SUBSTANTIALLY CONSTANT RATE OF PHASE CHANGE, THEREBY TO COUNTERACT ANY FREQUENCY DIFFERENCE BETWEEN SAID RECEIVED AND SAID TRANSMITTED PERIODIC SIGNAL.
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) | 1967-04-21 | 1967-10-21 | 1968-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-04-21 | 1971-10-21 | 1972-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-04-21 | 1975-10-21 | 1976-04-21 | $7700.00 | Window Closed / Lapsed |