US3716336A
Expired / Lapsed
US
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Method for determining procainamide levels in blood or urine
Assignee: ER Squibb and Sons LLC
•
Filing: 1971-06-28
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Granted: 1973-02-13
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Expires: 1991-06-28
Abstract
Abstract A qualitative and quantitative determination of procainamide blood levels may be obtained by contacting a sample of urine or denatured blood with dimethylcinnamaldehyde in the presence of an acid and comparing the resulting characteristic color with a reference standard.
Inventors
- 👤 C Parekh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:27
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/48; G01N33/50; G01N33/52; Y; Y10; Y10T; Y10T436/00; Y10T436/17; Y10T436/173845; Y10T436/174614
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
31 words
A method for determining procainamide blood levels which comprises contacting urine or denatured blood with 4-dimethylcinnamaldehyde in the presence of an acid and cOmparing the resulting color with a predetermined standard.
Claim 2
Independent Claim
31 words
A method for determining procainamide blood levels which comprises contacting urine or denatured blood with 4-dimethylcinnamaldehyde in the presence of an acid and cOmparing the resulting color with a predetermined standard.
Claim 3
Dependent Claim
17 words
A method according to claim 1 wherein the acid is acetic, trichloroacetic, sulfamic, nitric, sulfuric or sulfosalicylic.
Claim 4
Dependent Claim
16 words
A method according to claim 1 wherein the blood is denatured by contacting an acidic medium.
Claim 5
Dependent Claim
16 words
A method according to claim 3 wherein the acidic medium is an acidic ion exchange resin.
Claim 6
Dependent Claim
23 words
A method according to claim 4 wherein the acidic ion exchange resin and the 4-dimethylcinnamaldehyde are in intimate admixture in a single layer.
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) | 1976-02-13 | 1976-08-14 | 1977-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-13 | 1980-08-14 | 1981-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-13 | 1984-08-14 | 1985-02-13 | $7700.00 | Window Closed / Lapsed |