Patent US4996685A successfully refreshed from Google Patents.
Patent US3270339A successfully refreshed from Google Patents.
US3270339A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Intruder alarm system
Assignee: Varian Medical Systems Inc
•
Filing: 1962-01-08
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Granted: 1966-08-30
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Expires: 1982-01-08
Abstract
No abstract record available.
Inventors
- 👤 Albert H Mceuen
- 👤 Richard M Whitehorn
- 👤 Robert E Dye
- 👤 Edward J Murphy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:49
CPC Classifications
H; H03; H03D; H03D9/00; H03D9/06; H03D9/0608; H03D9/0633; H03D9/0641; G; G01; G01S; G01S13/00; G01S13/02; G01S13/50; G01S13/52; G01S13/56; H01; H01P; H01P1/00; H01P1/16; H01P1/161; H03D7/00; H03D7/14; H03D7/1408; H03D9/0616
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
153 words
IN A HIGH FREQUENCY ELECTROMAGNETIC WAVE ENERGY INTRUDER ALARM SYSTEM; MEANS FOR GENERATING ELECTROMAGNETIC WAVE ENERGY; MEANS FOR SIMULTANEOUSLY RADIATING AND RECEIVING REFLECTED WAVE ENERGY; MEANS FOR COUPLING WAVE ENERGY FROM SAID WAVE ENERGY GENERATING MEANS TO SAID RADIATING MEANS; SAID RADIATING AND RECEIVING MEANS RADIATING THE WAVE ENERGY INTO A REGION OF SPACE TO BE MONITORED AND RECEIVING REFLECTED WAVE ENERGY THEREFROM; SAID RADIATING AND RECEIVING MEANS INCLUDING, A MIXER-DUPLEXER ASSEMBLY FOR MIXING THE GENERATED WAVE ENERGY WITH SAID REFLECTED WAVE ENERGY TO DETECT ANY DIFFERENCE FREQUENCY BETWEEN THE RADIATED FREQUENCY AND THE REFLECTED WAVE ENERGY THERBY TO PRODUCE AN AUDIO BEAT FREQUENCY OUTPUT SIGNAL; AND AN INTRUDER ALARM DEVICE ACTUATED BY SAID OUTPUT SIGNAL TO ANNOUNCE THE PRESENCE OF AN INTRUDER IN THE MONITORED REGION, WHEREIN SAID COUPLING MEANS FOR COUPLING WAVE ENERGY FROM SAID WAVE GENERATING MEANS TO SAID READIATING MEANS INCLUDES A HOLLOW WAVEGUIDE HAVING A CENTRAL LONGITUDINAL AXIS
Claim 2
Dependent Claim
153 words
IN A HIGH FREQUENCY ELECTROMAGNETIC WAVE ENERGY INTRUDER ALARM SYSTEM; MEANS FOR GENERATING ELECTROMAGNETIC WAVE ENERGY; MEANS FOR SIMULTANEOUSLY RADIATING AND RECEIVING REFLECTED WAVE ENERGY; MEANS FOR COUPLING WAVE ENERGY FROM SAID WAVE ENERGY GENERATING MEANS TO SAID RADIATING MEANS; SAID RADIATING AND RECEIVING MEANS RADIATING THE WAVE ENERGY INTO A REGION OF SPACE TO BE MONITORED AND RECEIVING REFLECTED WAVE ENERGY THEREFROM; SAID RADIATING AND RECEIVING MEANS INCLUDING, A MIXER-DUPLEXER ASSEMBLY FOR MIXING THE GENERATED WAVE ENERGY WITH SAID REFLECTED WAVE ENERGY TO DETECT ANY DIFFERENCE FREQUENCY BETWEEN THE RADIATED FREQUENCY AND THE REFLECTED WAVE ENERGY THERBY TO PRODUCE AN AUDIO BEAT FREQUENCY OUTPUT SIGNAL; AND AN INTRUDER ALARM DEVICE ACTUATED BY SAID OUTPUT SIGNAL TO ANNOUNCE THE PRESENCE OF AN INTRUDER IN THE MONITORED REGION, WHEREIN SAID COUPLING MEANS FOR COUPLING WAVE ENERGY FROM SAID WAVE GENERATING MEANS TO SAID READIATING MEANS INCLUDES A HOLLOW WAVEGUIDE HAVING A CENTRAL LONGITUDINAL AXIS
References Cited (Backward Citations)
US2629773A
Cited
US2833993A
Cited
US2840787A
Cited
US2784315A
Cited
US2782405A
Cited
US2794974A
Cited
US2760070A
Cited
US3048844A
Cited
US2903683A
Cited
US3031659A
Cited
US3066290A
Cited
US3139617A
Cited
US3187329A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-08-29 | 1970-02-28 | 1970-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-29 | 1974-02-28 | 1974-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-29 | 1978-02-28 | 1978-08-30 | $7700.00 | Window Closed / Lapsed |