US3645691A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of quantitatively determining iodine and thyroid hormones
Assignee: Individual
•
Filing: 1969-02-26
•
Granted: 1972-02-29
•
Expires: 1989-02-26
Abstract
Abstract Improved method of quantitatively determining iodine or thyroid hormones according to the method of Sandell and Kolthoff by replacing sulfuric acid by nitric acid. A preferred measuring apparatus consists of a thermostat, a photometer, and an evaluating and plotting instrument.
Inventors
- 👤 Guenter Knapp
- 👤 Hans Spitzy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 18:08
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/48; G01N33/50; G01N33/74; G01N33/78; Y; Y10; Y10T; Y10T436/00; Y10T436/19
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
30 words
The method according to claim 1, wherein the reactants are admixed in step (a) to the test solution in the order arsenous acid, nitric acid, and cerium (IV) compound solution.
Claim 2
Dependent Claim
34 words
The method according to claim 1, wherein the test solution is first mixed with arsenous acid, nitric acid, and cerium (IV) compound solution whereafter the reaction mixture is adjusted to the constant reaction temperature.
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) | 1975-02-28 | 1975-08-30 | 1976-02-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-28 | 1979-08-30 | 1980-02-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-28 | 1983-08-30 | 1984-02-29 | $7700.00 | Window Closed / Lapsed |