Patent US3771964A successfully refreshed from Google Patents.
US3771964A
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Test composition and device for ascorbic acid determination
Assignee: Bayer Corp
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Filing: 1972-02-28
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Granted: 1973-11-13
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Expires: 1992-02-28
Abstract
Abstract Test composition for determining ascorbic acid in fluids and the relative concentration of ascorbic acid present therein. The composition includes a solution containing an indicator stablized with a nitrate compound. The composition may be used as a spot test or incorporated with a carrier such as a bibulous material and dried to form a dip and read test device. An organic acid may also be included in the composition to prevent urate interference and adapt the composition for testing urine specimens.
Inventors
- 👤 Fader M Lloyd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:55
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/48; G01N33/50; G01N33/82; Y; Y10; Y10T; Y10T436/00; Y10T436/10; Y10T436/107497; Y10T436/108331; Y10T436/14; Y10T436/142222
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
26 words
A test composition as defined in claim 1 wherein the solution contains from about 0.1 percent to about 0.6 percent by weight of the phosphomolybdate salts.
Claim 2
Dependent Claim
27 words
A test composition as defined in claim 2 wherein said solution contains from about 1.0 percent to about 10.0 percent by weight of the said nitrate salt.
Claim 3
Dependent Claim
15 words
A test composition as defined in claim 3 wherein said nitrate salt is sodium nitrate.
Claim 4
Dependent Claim
24 words
A test device for determining the presence of ascorbic acid in fluids comprising a dry carrier material incorporated with the composition of claim 1.
Claim 5
Dependent Claim
17 words
A test device as defined in claim 5 wherein said composition also contains a solid organic acid.
Claim 6
Dependent Claim
15 words
A test device as defined in claim 6 wherein said organic acid is malonic acid.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-12 | 1977-05-14 | 1977-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-12 | 1981-05-14 | 1981-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-12 | 1985-05-14 | 1985-11-13 | $7700.00 | Window Closed / Lapsed |