US4227398A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piezoelectric gum measurement device
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1979-06-14
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Granted: 1980-10-14
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Expires: 1999-06-14
Abstract
Abstract An improved apparatus for measuring high-boiling components and particularly existent gum levels in aviation fuel comprising: a piezoelectric crystal, a lipophobic coating applied to the crystal for controlling sample location, a supply device for applying a sample to the crystal, a heater for heating the sample on the crystal, an evacuator, an oscillator associated with the crystal for measuring the resonant frequency thereof and an insulated housing for the crystal and heater.
Inventors
- 👤 Mary H. Keirns
- 👤 Robert S. Lunt, III
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:30
CPC Classifications
G; G01; G01N; G01N29/00; G01N29/02; G01N29/036; G01N33/00; G01N33/26; G01N33/28; G01N33/2835; G01N5/00; G01N5/04; G01N2291/00; G01N2291/02; G01N2291/025; G01N2291/0256
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
77 words
An apparatus for measuring high boiling point components and gum present in a liquid stream comprising: (a) piezoelectric crystal means; (b) a lipophobic coating applied to said crystal means for controlling sample location; (c) means for applying a sample to said crystal; (d) heater means for heating sample on said crystal; (e) oscillator means associated with said crystal for measuring the resonant frequency thereof; (f) evacuator means; and (g) insulated housing means for said crystal and heater.
Claim 2
Independent Claim
77 words
An apparatus for measuring high boiling point components and gum present in a liquid stream comprising: (a) piezoelectric crystal means; (b) a lipophobic coating applied to said crystal means for controlling sample location; (c) means for applying a sample to said crystal; (d) heater means for heating sample on said crystal; (e) oscillator means associated with said crystal for measuring the resonant frequency thereof; (f) evacuator means; and (g) insulated housing means for said crystal and heater.
Claim 3
Dependent Claim
34 words
The apparatus of claim 1 wherein said lipophobic coating is applied to said crystal in the form of a ring about the center of the crystal to confine the sample to the center thereof.
Claim 4
Dependent Claim
18 words
The apparatus of claim 2 wherein said ring has an inner diameter of up to about 0.40 inches.
Claim 5
Dependent Claim
22 words
The apparatus of claim 3 wherein said lipophobic coating material is selected from the group consisting of Teflon, silicones and olefinic polymers.
Claim 6
Dependent Claim
18 words
The apparatus of claim 4 wherein said ring has an inner diameter of up to about 0.33 inches.
Claim 7
Dependent Claim
12 words
The apparatus of claim 5 wherein said crystal is made of quartz.
Claim 8
Dependent Claim
12 words
The apparatus of claim 6 wherein said lipophobic coating material is Teflon.
Claim 9
Dependent Claim
49 words
The apparatus of claim 1 wherein said lipophobic coating is applied to said crystal in the form of a solid thin film having sufficient thickness such that a sample material deposited thereon will not spread but rather bead up in a mass and still allow said crystal to oscillate.
Claim 10
Dependent Claim
22 words
The apparatus of claim 8 wherein said lipophobic coating material is selected from the group consisting of Teflon, silicones and olefinic polymers.
Claim 11
Dependent Claim
19 words
The apparatus of claim 9 wherein said crystal is made of quartz and said lipophobic coating material is Teflon.
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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) | 1983-10-14 | 1984-04-14 | 1984-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-10-14 | 1988-04-14 | 1988-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-10-14 | 1992-04-14 | 1992-10-14 | $7700.00 | Window Closed / Lapsed |