US4376827A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composition, test device and method for determining the ionic strength or specific gravity of a liquid sample utilizing a strong polyelectrolyte
Assignee: Bayer Corp
•
Filing: 1981-03-23
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Granted: 1983-03-15
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Expires: 2001-03-23
Abstract
Abstract A composition is disclosed for determining the ionic strength or specific gravity of an aqueous test sample, the composition comprising a strongly acidic or strongly basic polyelectrolyte, a buffer substance capable of providing a pH of about 5.5, and an indicator means capable of producing a detectable response to ion exchange between the polyelectrolyte and the sample. The test device comprises a carrier matrix incorporated with the test composition, and the method for its use comprises contacting an aqueous test sample with the device and observing a detectable response.
Inventors
- 👤 Sisto N. Stiso
- 👤 Rodric H. White-Stevens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:41
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/48; G01N33/50; G01N33/52; G01N33/521; G01N33/483; G01N33/487; G01N33/493; G01N9/00
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
47 words
A composition capable of producing a detectable response indicative of the specific gravity of a liquid test sample, said composition comprising: a strongly acidic or strongly basic polyelectrolyte polymer, a buffer substance capable of providing a pH of at least about 5.5, and a pH indicator compound.
Claim 2
Dependent Claim
47 words
A composition capable of producing a detectable response indicative of the specific gravity of a liquid test sample, said composition comprising: a strongly acidic or strongly basic polyelectrolyte polymer, a buffer substance capable of providing a pH of at least about 5.5, and a pH indicator compound.
Claim 3
Dependent Claim
18 words
The composition of claim 1 wherein said polyelectrolyte is poly(styrene sulfonic acid), poly(vinyl sulfuric acid), or poly(vinylbenzylammonium chloride).
Claim 4
Dependent Claim
12 words
The composition of claim 1, wherein said polyelectrolyte is poly(styrene sulfonic acid).
Claim 5
Dependent Claim
18 words
The composition of claims 1, 2 or 3 wherein said buffer substance is citrate, phosphate, glycylglycine or bicarbonate.
Claim 6
Dependent Claim
11 words
The composition of claim 4 wherein said buffer substance is phosphate.
Claim 7
Dependent Claim
19 words
The composition of claims 1, 2 or 3 wherein said pH indicator compound is bromthymol blue or bromcresol purple.
Claim 8
Dependent Claim
16 words
The composition of claim 4 wherein said pH indicator compound is bromthymol blue or bromcresol purple.
Claim 9
Dependent Claim
16 words
The composition of claims 1, 2 or 3 wherein said pH indicator compound is bromthymol blue.
Claim 10
Dependent Claim
13 words
The composition of claim 4 wherein said pH indicator compound is bromthymol blue.
Claim 11
Dependent Claim
28 words
A composition capable of producing a detectable response indicative of the specific gravity of a liquid test sample, said composition comprising poly(styrene sulfonic acid), phosphate, and bromthymol blue.
Claim 12
Dependent Claim
28 words
A composition capable of producing a detectable response indicative of the specific gravity of a liquid test sample, said composition comprising poly(styrene sulfonic acid), phosphate, and bromthymol blue.
Claim 13
Dependent Claim
52 words
A test device capable of producing a detectable response indicative of the specific gravity of a liquid test sample, the device comprising a carrier matrix incorporated with a strongly acidic or strongly basic polyelectrolyte polymer, a buffer substance capable of providing a pH of at least 5.5, and a pH indicator means.
Claim 14
Dependent Claim
52 words
A test device capable of producing a detectable response indicative of the specific gravity of a liquid test sample, the device comprising a carrier matrix incorporated with a strongly acidic or strongly basic polyelectrolyte polymer, a buffer substance capable of providing a pH of at least 5.5, and a pH indicator means.
Claim 15
Dependent Claim
19 words
The device of claim 11 wherein said polyelectrolyte polymer is poly(styrene sulfonic acid), poly(vinyl sulfuric acid), or poly(vinylbenzylammonium chloride).
Claim 16
Dependent Claim
13 words
The device of claim 11 wherein said polyelectrolyte polymer is poly(styrene sulfonic acid).
Claim 17
Dependent Claim
15 words
The device of claim 11 wherein said buffer substance is citrate, phosphate, glycylglycine or bicarbonate.
Claim 18
Dependent Claim
12 words
The test device of claim 11 wherein said buffer substance is phosphate.
Claim 19
Dependent Claim
16 words
The device of claim 11 wherein said pH indicator means is bromthymol blue or bromcresol purple.
Claim 20
Dependent Claim
26 words
The device of claim 11 wherein said buffer substance is citrate, phosphate, glycylglycine or bicarbonate, and said pH indicator means is bromthymol blue or bromcresol purple.
Claim 21
Independent Claim
17 words
The device of one of claims 12 or 13 wherein said pH indicator means is bromthymol blue.
Claim 22
Dependent Claim
23 words
The device of claim 11 wherein said buffer substance is citrate, phosphate, glycylglycine or bicarbonate, and said pH indicator means is bromthymol blue.
Claim 23
Dependent Claim
26 words
The device of claim 11 wherein said polyelectrolyte polymer is poly(styrene sulfonic acid), said buffer substance is phosphate, and said pH indicator means is bromthymol blue.
Claim 24
Independent Claim
36 words
A method for determining the specific gravity of a liquid test sample, said method comprising contacting the liquid test sample with the device of one of claims 11-17, 19 and 20 and observing said detectable response.
Claim 25
Dependent Claim
31 words
A method for determining the specific gravity of a liquid test sample, said method comprising contacting the liquid test sample with the device of claim 18, and observing said detectable response.
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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) | 1986-03-14 | 1986-09-13 | 1987-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-03-14 | 1990-09-13 | 1991-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-03-14 | 1994-09-13 | 1995-03-15 | $7700.00 | Window Closed / Lapsed |