US3884187A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mastitis detector
Assignee: Chalton Electronic Services Ltd
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Filing: 1973-09-21
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Granted: 1975-05-20
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Expires: 1993-09-21
Abstract
Abstract 17. Apparatus according to claim 14 in which a lower one of said ports has a tubular extension into the interior of said cell, the outer wall of the tubular extension and a portion of the inner wall of the spherical wall defining an annular well, said electrodes having ends spaced apart within said well and said tubular extension having a duct therethrough connecting said well to said one port.
Inventors
- 👤 Kenneth Herbert Massie
- 👤 Gordon Alfred Chalton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:40
CPC Classifications
A; A01; A01J; A01J5/00; A01J5/013; A01J5/0135; A01J5/0133; G; G01; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/06
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
112 words
Milk conductivity indicating apparatus comprising a conductivity cell having two electrodes between which the milk is adapted to be passed during milking, means for supplying electric current to said cell, said current being attenuated in said cell to a greater or lesser extent according to the lesser or greater conductivity of the milk between said electrodes, trigger means responsive to the attenuation of said current so as to fire when the milk conductivity exceeds a predetermined value, indicating means for indicating response of said trigger means, and a curcuit for preventing activation of the trigger means in response to signals indicative of the conductivity of the fore milk passing through the cell.
Claim 2
Dependent Claim
112 words
Milk conductivity indicating apparatus comprising a conductivity cell having two electrodes between which the milk is adapted to be passed during milking, means for supplying electric current to said cell, said current being attenuated in said cell to a greater or lesser extent according to the lesser or greater conductivity of the milk between said electrodes, trigger means responsive to the attenuation of said current so as to fire when the milk conductivity exceeds a predetermined value, indicating means for indicating response of said trigger means, and a curcuit for preventing activation of the trigger means in response to signals indicative of the conductivity of the fore milk passing through the cell.
Claim 3
Dependent Claim
19 words
Apparatus according to claim 1 in which said electric current supplying means comprises a multivibrator for producing current pulses.
Claim 4
Dependent Claim
18 words
Apparatus according to claim 2 which includes a differentiating capacitor connected between the multivibrator and the conductivity cell.
Claim 5
Dependent Claim
16 words
Apparatus according to claim 3 which includes a resistor connected in series with the conductivity cell.
Claim 6
Dependent Claim
39 words
Apparatus according to claim 3 which includes a conductivity responsive capacitor and a diode connecting the last-mentioned capacitor to said conductivity cell whereby the last-mentioned capacitor can charge up to a voltage dependent upon the conductivity of the cell.
Claim 7
Dependent Claim
29 words
Apparatus according to claim 2 in which said trigger means comprises a Schmitt trigger for comparing a voltage dependent upon the conductivity of the cell with a reference voltage.
Claim 8
Dependent Claim
33 words
Apparatus according to claim 6 in which the Schmitt trigger is adapted to oscillate, when fixed, at a frequency dependent upon the amount by which the conductivity dependent voltage exceeds the reference voltage.
Claim 9
Dependent Claim
53 words
Apparatus according to claim 6 in which said delay circuit means has an input connected to said conductivity cell so as to be triggered immediately said cell commences to conduct and has an output connected to the input of the Schmitt trigger to suppress said conductivity dependent voltage for said predetermined initial period.
Claim 10
Dependent Claim
56 words
Apparatus according to claim 3 in which said delay circuit means has its input connected via a diode to said conductivity cell so as to be triggered immediately said cell commences to conduct and has its output connecteD to the input of said trigger means to prevent the latter from responding for said predetermined initial period.
Claim 11
Dependent Claim
19 words
Apparatus according to claim 1 in which the delay period of said delay circuit means is about one minute.
Claim 12
Dependent Claim
15 words
Apparatus according to claim 1 in which said indicating means comprises a light emitting device.
Claim 13
Dependent Claim
14 words
Apparatus according to claim 1 in which said indicating means comprises an audible alarm.
Claim 14
Dependent Claim
34 words
Apparatus as claimed in claim 1 in which the output of the trigger circuit is used to actuate a reed relay for connecting the indicating means to the power supply circuit of the apparatus.
Claim 15
Dependent Claim
33 words
Apparatus according to claim 1 in which said conductivity cell comprises a casing defined by a generally spherical wall with diametrically opposed inlet and outlet ports and two electrodes disposed in said wall.
Claim 16
Dependent Claim
14 words
Apparatus according to claim 14 in which said cell wall is made from polycarbonate.
Claim 17
Dependent Claim
13 words
Apparatus according to claim 14 in which said electrodes are made from graphite.
Claim 18
Dependent Claim
69 words
Apparatus according to claim 14 in which a lower one of said ports has a tubular extension into the interior of said cell, the outer wall of the tubular extension and a portion of the inner wall of the spherical wall defining an annular well, said electrodes having ends spaced apart within said well and said tubular extension having a duct therethrough connecting said well to said one port.
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) | 1978-05-19 | 1978-11-18 | 1979-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-19 | 1982-11-18 | 1983-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-19 | 1986-11-18 | 1987-05-20 | $7700.00 | Window Closed / Lapsed |