US5023133A
Expired / Lapsed
US
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Acid sensor
Assignee: Lubrizol Corp
•
Filing: 1990-02-01
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Granted: 1991-06-11
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Expires: 2010-02-01
Abstract
Abstract The present invention describes devices capable of sensing changes of acidity in a non-aqueous medium. The devices are particularly useful for determining the alkaline reserve in a motor vehicle lubricating oil.
Inventors
- 👤 Richard Yodice
- 👤 Richard E. Gapinski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:33
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/12; G01N27/125; G01N27/126; G01N33/00; G01N33/26; G01N33/28; G01N33/2888; Y; Y10; Y10T; Y10T428/00; Y10T428/26; Y10T428/269; Y10T428/29; Y10T428/2982
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
34 words
A polymer article comprising a partially protonated polyaniline polymer having a thickness in the range from about 0.1 to 2 mm, wherein the greatest axis of the article is up to about 25 mm.
Claim 2
Dependent Claim
34 words
A polymer article comprising a partially protonated polyaniline polymer having a thickness in the range from about 0.1 to 2 mm, wherein the greatest axis of the article is up to about 25 mm.
Claim 3
Dependent Claim
12 words
The article of claim 1 in the form of a cylindrical pellet.
Claim 4
Dependent Claim
11 words
The article of claim 1 in the form of a disk.
Claim 5
Dependent Claim
21 words
The article of claim 3 wherein the disk has a thickness in the range of about 0.4 to about 1.5 mm.
Claim 6
Dependent Claim
39 words
The article of claim 1 wherein the polymer has a resistance to the flow of electrons in the range of from about 2.4×10 6 to 2.6×10 6 ohm/cm measured at 55° C. in an additive-free oil of lubricating viscosity.
Claim 7
Dependent Claim
40 words
A polymer article comprising a solid partially protonated polyaniline polymer in the form of a cylindrical disk having a diameter in the range from 7.5 to 18 mm and a thickness in the range from about 0.1 to 2 mm.
Claim 8
Dependent Claim
40 words
A polymer article comprising a solid partially protonated polyaniline polymer in the form of a cylindrical disk having a diameter in the range from 7.5 to 18 mm and a thickness in the range from about 0.1 to 2 mm.
Claim 9
Dependent Claim
21 words
The article of claim 6 wherein the article has a thickness in the range from about 0.4 to about 1.5 mm.
Claim 10
Dependent Claim
37 words
The article of claim 6 wherein the polymer has resistance to the flow of electrons in the range from about 2.4×10 6 to 2.6×10 6 ohm/cm measured at 55° C. in an additive-free oil of lubricating viscosity.
Claim 11
Dependent Claim
38 words
The article of claim 6 wherein the article has a resistance to the flow of electrons in the range from about 1.5×10 6 to 1.7×10 6 ohm/cm measured at 65° C. in an additive-free oil of lubricating viscosity.
Claim 12
Dependent Claim
42 words
A solid partially protonated polyaniline polymer product prepared by: (A) deprotonating a polyaniline polymer by treating the polymer with a base and (B) reprotonating the deprotonated polymer obtained as a product of step (A) by treating the deprotonated polymer with an acid.
Claim 13
Dependent Claim
42 words
A solid partially protonated polyaniline polymer product prepared by: (A) deprotonating a polyaniline polymer by treating the polymer with a base and (B) reprotonating the deprotonated polymer obtained as a product of step (A) by treating the deprotonated polymer with an acid.
Claim 14
Dependent Claim
33 words
The polymer product of claim 10 wherein the base of (A) is sodium hydroxide, potassium hydroxide, sodium alkoxide, or potassium alkoxide, or a mixture thereof and the acid of (B) is hydrochloric acid.
Claim 15
Dependent Claim
73 words
The polymer product of claim 10 wherein step (B) comprises: (1) dispersing 1% by weight of the polymer obtained from step (A) in water adjusted to a pH of from 2 to 4 measured at a temperature of 25° C. and (2) maintaining the polymer-containing water of step (1) at a pH in the range from 2 to 4 measured at a temperature of 25° C. by adding acid to the polymer-containing water.
Claim 16
Dependent Claim
39 words
The polymer product of claim 10 wherein the polymer product has resistance to the flow of electrons in the range from about 2.4×10 6 to 2.6×10 6 ohm/cm measured at 55° C. in an additive-free oil of lubricating viscosity.
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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) | 1994-06-10 | 1994-12-10 | 1995-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-06-10 | 1998-12-10 | 1999-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-06-10 | 2002-12-10 | 2003-06-11 | $7700.00 | Window Closed / Lapsed |