US3234539A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Capacity alarm system with a loop sensor having an inductive radio frequency filter
Assignee: Specialties Development Corp
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Filing: 1965-02-25
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Granted: 1966-02-08
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Expires: 1985-02-25
Abstract
No abstract record available.
Inventors
- 👤 Samuel M Bagno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:31
CPC Classifications
G; G08; G08B; G08B13/00; G08B13/22; G08B13/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
140 words
A CAPACITANCE OPERATED INDICATING SYSTEM COMPRISING A SOURCE OF ALTERNATING CURRENT ELECTRICAL ENERGY, ANTENNA LOOP MEANS ENERGIZED BY SAID SOURCE FOR PROVIDING A CAPACITANCE ACROSS AN AREA TO BE PROTECTED, CAPACITY MONITORING MEANS INCLUDING IMPEDANCE ELEMENTS CONNECTED TO ONE END OF SAID ANTENNA LOOP TO FORM A BRIDGE CIRCUIT WITH SAID CAPACITANCE ACROSS SAID AREA TO BE PROTECTED, MEANS FOR GIVING AN INDICATION IN RESPONSE TO A CHANGE IN THE OUTPUT OF SAID CAPACITY MONITORING MEANS, AND RADIO FREQUENCY FILTERING MEANS FOR PREVENTING RADIO FREQUENCY SIGNALS INDUCED IN SAID ANTENNA LOOP MEANS FROM PRODUCING A CHANGE IN THE OUTPUT OF SAID CAPACITY MONITORING MEANS, SAID FILTERING MEANS INCLUDING A FIRST INDUCTANCE CONNECTED TO ONE END OF SAID ANTENNA LOOP AND A SECOND INDUCTANCE CONNECTED TO THE OTHER END OF SAID ANTENNA LOOP, SAID INDUCTANCES BEING ARRANGED IN SERIES BUCKING RELATIONSHIP.
Claim 2
Dependent Claim
140 words
A CAPACITANCE OPERATED INDICATING SYSTEM COMPRISING A SOURCE OF ALTERNATING CURRENT ELECTRICAL ENERGY, ANTENNA LOOP MEANS ENERGIZED BY SAID SOURCE FOR PROVIDING A CAPACITANCE ACROSS AN AREA TO BE PROTECTED, CAPACITY MONITORING MEANS INCLUDING IMPEDANCE ELEMENTS CONNECTED TO ONE END OF SAID ANTENNA LOOP TO FORM A BRIDGE CIRCUIT WITH SAID CAPACITANCE ACROSS SAID AREA TO BE PROTECTED, MEANS FOR GIVING AN INDICATION IN RESPONSE TO A CHANGE IN THE OUTPUT OF SAID CAPACITY MONITORING MEANS, AND RADIO FREQUENCY FILTERING MEANS FOR PREVENTING RADIO FREQUENCY SIGNALS INDUCED IN SAID ANTENNA LOOP MEANS FROM PRODUCING A CHANGE IN THE OUTPUT OF SAID CAPACITY MONITORING MEANS, SAID FILTERING MEANS INCLUDING A FIRST INDUCTANCE CONNECTED TO ONE END OF SAID ANTENNA LOOP AND A SECOND INDUCTANCE CONNECTED TO THE OTHER END OF SAID ANTENNA LOOP, SAID INDUCTANCES BEING ARRANGED IN SERIES BUCKING RELATIONSHIP.
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) | 1969-02-07 | 1969-08-09 | 1970-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-07 | 1973-08-09 | 1974-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-07 | 1977-08-09 | 1978-02-08 | $7700.00 | Window Closed / Lapsed |