Patent US3898640A successfully refreshed from Google Patents.
US3898640A
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Method and apparatus for providing space security based upon the acoustical characteristics of the space
Assignee: FASER-UND KUNSTSTOFF PRESSWERK ROMEN KG
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Filing: 1973-07-24
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Granted: 1975-08-05
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Expires: 1993-07-24
Abstract
Abstract An apparatus and method of providing securing protection for a space or a room, including the steps of generating a nondirectional sound wave field to fill the room to be protected, the sound wave field being inaudible to a human intruder, and detecting the non-directional sound wave field. A security measure, such as an alarm unit, is triggered responsive to the detected non-directional sound wave field in response to a minute change in the confines of the room to be protected, but not in response to movements in the room.
Inventors
- 👤 Erich Hossbach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:01
CPC Classifications
G; G08; G08B; G08B13/00; G08B13/16; G08B13/1609; G08B13/1654; G08B13/1681
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
111 words
A method of providing a security protection for a space, comprising the steps of: generating compressional oscillations in the infrasonic frequency range to occupy substantially completely said space to be protected, said compressional oscillations in the infrasonic frequency range having a frequency which is no greater than half the natural resonant frequency of said space; detecting the fundamental compressional wave of said compressional oscillations in the infrasonic frequency range; and triggering a security measure responsive to the detected fundamental compressional wave of said compressional oscillations in the infrasonic frequency range in response to changes in the effective volume of said space to be protected independently of any movement within said space.
Claim 2
Independent Claim
111 words
A method of providing a security protection for a space, comprising the steps of: generating compressional oscillations in the infrasonic frequency range to occupy substantially completely said space to be protected, said compressional oscillations in the infrasonic frequency range having a frequency which is no greater than half the natural resonant frequency of said space; detecting the fundamental compressional wave of said compressional oscillations in the infrasonic frequency range; and triggering a security measure responsive to the detected fundamental compressional wave of said compressional oscillations in the infrasonic frequency range in response to changes in the effective volume of said space to be protected independently of any movement within said space.
Claim 3
Dependent Claim
40 words
A method according to claim 1, further including the step of: detecting a node shift in the detected fundamental compressional wave of said compressional oscillations in the infrasonic frequency range occasioned by changes in the effective volume of said space.
Claim 4
Dependent Claim
50 words
The method of claim 1 further including the step of saturating said space and a second space with said compressional oscillations in the infrasonic frequency range to simultaneously protect both spaces, said second space having an effective volume which is substantially equal to said effective volume of said first-mentioned space.
Claim 5
Dependent Claim
40 words
A method according to claim 1, further including the step of: detecting a phase shift in the detected fundamental compressional wave of said compressional oscillations in the infrasonic frequency range occasioned by changes in the effective volume of said space.
Claim 6
Dependent Claim
29 words
A method according to claim 1, including the step of modulating said generated compressional oscillations in the infrasonic frequency range to occupy substantially completely said space to be protected.
Claim 7
Independent Claim
73 words
A system for providing security for a space comprising: means for saturating said space with compressional oscillations in the infrasonic frequency range having a frequency which is no greater than half the natural resonant frequency of said space; means for detecting the fundamental compressional wave of said compressional oscillations in the infrasonic frequency range; and means responsive to said detecting means for producing an alarm when the effective volume of said space changes.
Claim 8
Independent Claim
73 words
A system for providing security for a space comprising: means for saturating said space with compressional oscillations in the infrasonic frequency range having a frequency which is no greater than half the natural resonant frequency of said space; means for detecting the fundamental compressional wave of said compressional oscillations in the infrasonic frequency range; and means responsive to said detecting means for producing an alarm when the effective volume of said space changes.
Claim 9
Dependent Claim
34 words
The system of claim 6 wherein said means for detecting is responsive to phase changes in said fundamental compressional wave of said compressional oscillations in the infrasonic frequency range when said effective volume changes.
Claim 10
Dependent Claim
34 words
The system of claim 6 wherein said means for detecting is responsive to frequency changes in the fundamental compressional wave of said compressional oscillations in the infrasonic frequency range when said effective volume changes.
Claim 11
Dependent Claim
34 words
The system of claim 6 wherein said means for detecting is responsive to amplitude changes in the fundamental compressional wave of said compressional oscillations in the infrasonic frequency range when said effective volume changes.
Claim 12
Dependent Claim
69 words
The system of claim 6 wherein said means responsive to said detecting means receives a first signal representative of the fundamental compressional wave of said first-mentioned compressional oscillations in the infrasonic frequency range, and a second signal representative of said detected fundamental compressional wave of the compressional oscillations in the infrasonic frequency range, and produces said alarm when said second signal changes in response to said effective volume changes.
Claim 13
Dependent Claim
33 words
The system of claim 6 wherein said means for detecting includes a differential amplifier and a selective negative feedback in electrical communication therewith said amplifier and said feedback cooperating to define a discriminator.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-04 | 1979-02-03 | 1979-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-04 | 1983-02-03 | 1983-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-04 | 1987-02-03 | 1987-08-05 | $7700.00 | Window Closed / Lapsed |