US3612446A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Means and method for preventing the formation of audible frequencies in fluids passing over an airfoil section
Assignee: Individual
•
Filing: 1969-10-10
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Granted: 1971-10-12
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Expires: 1989-10-10
Abstract
Abstract Means and method for preventing the formation of audible frequencies in fluids passing over an airfoil section in which the potential audible frequencies are converted into inaudible frequencies at the source of the fluid disturbance with the airfoil section.
Inventors
- 👤 Herbert A Lebert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:12
CPC Classifications
B; B64; B64C; B64C21/00; B64C21/02; B64C2230/00; B64C2230/02; B64C2230/04; B64C2230/14; B64C2230/20; Y; Y02; Y02T; Y02T50/00; Y02T50/10
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
91 words
The method for preventing the formation of audible frequencies in fluids passing over an airfoil section comprising the conversion of potential audible frequencies into inaudible frequencies at the source of the fluid disturbance with the airfoil section, i.e., at the leading portion of said section, and in which the conversion is accomplished by providing organ pipe configurations in the surface of the airfoil surface that contacts the fluids, with the fluids passing over edges of the configurations to produce standing waves in the configurations that impart their frequencies to the fluids.
Claim 2
Independent Claim
91 words
The method for preventing the formation of audible frequencies in fluids passing over an airfoil section comprising the conversion of potential audible frequencies into inaudible frequencies at the source of the fluid disturbance with the airfoil section, i.e., at the leading portion of said section, and in which the conversion is accomplished by providing organ pipe configurations in the surface of the airfoil surface that contacts the fluids, with the fluids passing over edges of the configurations to produce standing waves in the configurations that impart their frequencies to the fluids.
Claim 3
Dependent Claim
51 words
The method for preventing the formation of audible frequencies in fluids passing over an airfoil section, as set forth in claim 1; and in which the waves impart their frequencies below or above the limits of the human ear, i.e., in the range between 20 and 20,000 cycles per second, respectively.
Claim 4
Independent Claim
78 words
The method for preventing the formation of audible frequencies in fluids passing over an airfoil section comprising the conversion of potential audible frequencies into inaudible frequencies at the source of the fluid disturbance with the airfoil section, i.e., at the lead portion of said section; and in which the conversion is accomplished by vibrating the surface of the airfoil section that contacts the fluids, with the vibrations imparting their frequencies to the fluids in the inaudible frequency range.
Claim 5
Independent Claim
78 words
The method for preventing the formation of audible frequencies in fluids passing over an airfoil section comprising the conversion of potential audible frequencies into inaudible frequencies at the source of the fluid disturbance with the airfoil section, i.e., at the lead portion of said section; and in which the conversion is accomplished by vibrating the surface of the airfoil section that contacts the fluids, with the vibrations imparting their frequencies to the fluids in the inaudible frequency range.
Claim 6
Dependent Claim
49 words
The method for preventing the formation of audible frequencies in fluids passing over an airfoil section, as set forth in claim 3; and in which the vibrations are below or above the limits of the human ear, i.e., in the range between 20 and 20,000 cycles per second, respectively.
Claim 7
Dependent Claim
91 words
An airfoil section movable through fluids and having a surface over which the fluids pass, the surface having means for converting potential audible frequencies into inaudible frequencies at the source of the fluid disturbance with the airfoil section, i.e., at the leading portion of said section, and in which the conversion is accomplished by organ pipe configurations in the surface of the airfoil section that contacts the fluids, with tHe fluids passing over edges of the configurations to produce standing waves in the configurations that impart their frequencies to the fluids.
Claim 8
Dependent Claim
91 words
An airfoil section movable through fluids and having a surface over which the fluids pass, the surface having means for converting potential audible frequencies into inaudible frequencies at the source of the fluid disturbance with the airfoil section, i.e., at the leading portion of said section, and in which the conversion is accomplished by organ pipe configurations in the surface of the airfoil section that contacts the fluids, with tHe fluids passing over edges of the configurations to produce standing waves in the configurations that impart their frequencies to the fluids.
Claim 9
Dependent Claim
37 words
The combination, as set forth in claim 5; and in which the waves impart their frequencies below or above the limits of the human ear, i.e., in the range between 20 and 20,000 cycles per second, respectively.
Claim 10
Dependent Claim
81 words
An airfoil section movable through fluids and having a surface over the fluids pass, the surface over the fluids pass, the surface having means for converting potential audible frequencies into inaudible frequencies at the source of fluid disturbance with the air foil section, i.e., at the leading portion of said section; and in which oscillators, or the like, are provided for vibrating the surface of the airfoil section that contacts the fluids, with the vibrations being in the inaudible frequency range.
Claim 11
Dependent Claim
81 words
An airfoil section movable through fluids and having a surface over the fluids pass, the surface over the fluids pass, the surface having means for converting potential audible frequencies into inaudible frequencies at the source of fluid disturbance with the air foil section, i.e., at the leading portion of said section; and in which oscillators, or the like, are provided for vibrating the surface of the airfoil section that contacts the fluids, with the vibrations being in the inaudible frequency range.
Claim 12
Dependent Claim
37 words
The combination, as set forth in claim 7; and in which the vibrations impart their frequencies below or above the limits of the human ear, i.e., in the range between 20 and 20,000 cycles per second, respectively.
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) | 1974-10-11 | 1975-04-12 | 1975-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-11 | 1979-04-12 | 1979-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-11 | 1983-04-12 | 1983-10-12 | $7700.00 | Window Closed / Lapsed |