US3237191A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Object detection system
Assignee: Pinkertons Inc
•
Filing: 1963-05-28
•
Granted: 1966-02-22
•
Expires: 1983-05-28
Abstract
No abstract record available.
Inventors
- 👤 Bojko George
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:57
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/02; G01S13/50; G01S13/52; G01S13/56
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
139 words
IN AN ELECTROMAGNETIC OBJECT DETECTION DEVICE THE COMBINATION OF: MEANS INCLUDING A RADIO ENERGY TRANSMITTER FOR PRODUCING A STANDING WAVE PATTERN BETWEEN SAID DEVICE AND A REFLECTING SURFACE, SAID PATTERN CONTAINING SPACED NODES AND ANTI-NODES OF RADIO FREQUENCY ENERGY; MEANS FOR DETECTING CHANGES IN THE LOCATIONS OF SAID NODES AND ANTI-NODES CAUSED BY A CHANGE OF POSITION OF A REFLECTING OBJECT IN THE SAID FIELD OF SAID PATTERN SAID MEANS INCLUDING A PAIR OF SPACED ANTENNAS, SEPARATE MEANS FOR QUANTITATIVELY SENSING IMPEDANCE CHANGES AT EACH SAID ANTENNA WITH THE OUTPUT OF ONE SAID SENSING MEANS BEING INVERTED WITH RESPECT TO THE OTHER, MEANS FOR DIFFERENTIALLY COMBINING THE OUTPUTS OF SAID SENSING MEANS, AND SAID ANTENNAS BEING SPACED APART BY A DISTANCE GREATER THAN THE DISTANCE AT WHICH SAID ANTENNAS RESPOND SUBSTANTIALLY IDENTICALLY TO CHANGES IN SAID STANDING WAVE PATTERN.
Claim 2
Dependent Claim
139 words
IN AN ELECTROMAGNETIC OBJECT DETECTION DEVICE THE COMBINATION OF: MEANS INCLUDING A RADIO ENERGY TRANSMITTER FOR PRODUCING A STANDING WAVE PATTERN BETWEEN SAID DEVICE AND A REFLECTING SURFACE, SAID PATTERN CONTAINING SPACED NODES AND ANTI-NODES OF RADIO FREQUENCY ENERGY; MEANS FOR DETECTING CHANGES IN THE LOCATIONS OF SAID NODES AND ANTI-NODES CAUSED BY A CHANGE OF POSITION OF A REFLECTING OBJECT IN THE SAID FIELD OF SAID PATTERN SAID MEANS INCLUDING A PAIR OF SPACED ANTENNAS, SEPARATE MEANS FOR QUANTITATIVELY SENSING IMPEDANCE CHANGES AT EACH SAID ANTENNA WITH THE OUTPUT OF ONE SAID SENSING MEANS BEING INVERTED WITH RESPECT TO THE OTHER, MEANS FOR DIFFERENTIALLY COMBINING THE OUTPUTS OF SAID SENSING MEANS, AND SAID ANTENNAS BEING SPACED APART BY A DISTANCE GREATER THAN THE DISTANCE AT WHICH SAID ANTENNAS RESPOND SUBSTANTIALLY IDENTICALLY TO CHANGES IN SAID STANDING WAVE PATTERN.
References Cited (Backward Citations)
US2247246A
Cited
US2424677A
Cited
US2490238A
Cited
US2660718A
Cited
US2656527A
Cited
US2826753A
Cited
US2808278A
Cited
US2956269A
Cited
US3005191A
Cited
US3022499A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-02-21 | 1969-08-23 | 1970-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-21 | 1973-08-23 | 1974-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-21 | 1977-08-23 | 1978-02-22 | $7700.00 | Window Closed / Lapsed |