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US4246133A
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Stabilized diazotized sulfanilic acid solutions
Assignee: Sherwood Medical Co
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Filing: 1979-06-22
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Granted: 1981-01-20
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Expires: 1999-06-22
Abstract
Abstract Nitrilotris (methylene) triphosphonic acid and 1,3,6-napthalenetrisulfonic acid are used to stabilize solutions containing diazotized sulfanilic acid.
Inventors
- 👤 E. Melvin Gindler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:42
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/48; G01N33/50; G01N33/72; G01N33/728; Y; Y10; Y10T; Y10T436/00; Y10T436/10; Y10T436/103332; Y10T436/109163; Y10T436/14; Y10T436/145555
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
29 words
In a solution containing diazotized sulfanilic acid, the improvement wherein the solution also contains nitrilotris (methylene)-triphosphonic acid and 1,3,6-napthalenetrisulfonic acid in an amount which serves to stabilize said solution.
Claim 2
Dependent Claim
29 words
In a solution containing diazotized sulfanilic acid, the improvement wherein the solution also contains nitrilotris (methylene)-triphosphonic acid and 1,3,6-napthalenetrisulfonic acid in an amount which serves to stabilize said solution.
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) | 1984-01-20 | 1984-07-21 | 1985-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-20 | 1988-07-21 | 1989-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-20 | 1992-07-21 | 1993-01-20 | $7700.00 | Window Closed / Lapsed |