Patent US3628872A successfully refreshed from Google Patents.
US3628872A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spectrophotometric test apparatus and method employing retroflective means
Assignee: Baxter International Inc
•
Filing: 1969-11-06
•
Granted: 1971-12-21
•
Expires: 1989-11-06
Abstract
Abstract An improved method and apparatus are provided by which a selected radiation is passed through a test body and is subsequently measured, so as to determine the amount of the radiation absorbed by the body, and which involves the redirection of the radiation by retroreflective means through the test body directly back along its original path, prior to its detection by an appropriate radiation detector. In this way refraction effects due to flaws in the test body, which normally would direct random portions of the radiation away from the detector are cancelled, and the entire radiant beam is incident on the radiation detector despite such flaws.
Inventors
- 👤 Victor Eduardo Vasquez Miranda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:26
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/25; G01N21/255; G01N21/251
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
53 words
The apparatus defined in claim 1, in which said directing means is positioned between said radiation source and said test body, said directing means comprises a partially reflecting member capable of passing radiations from said source to said test body and of reflecting radiations redirected through said test body onto said radiation-detecting means.
Claim 2
Independent Claim
60 words
A method of testing the absorption characteristics of a test body on a selected radiation which comprises: directing a beam of the selected radiation through said test body; redirecting the beam of radiation back through said test body along its original path by retroreflective means; and directing the redirected beam of radiation from said test body to a radiation-detecting means.
Claim 3
Dependent Claim
87 words
Photometric apparatus including: a transparent vessel for containing a fluid test sample; a radiation source positioned to direct radiations through said vessel and through the test sample contained therein; a retroreflective member positioned on the opposite side of said vessel from said radiation source for reflecting the radiations back through said vessel and through the test sample contained therein; a radiation-sensing device; and means positioned adjacent said vessel for directing the radiations reflected through said vessel and through the test sample contained therein onto said radiation-sensing device.
Claim 4
Dependent Claim
15 words
The apparatus defined in claim 4, in which said radiation source is a light source.
Claim 5
Dependent Claim
24 words
The apparatus defined in claim 4, in which said radiation source is a light source, and in which said radiation-sensing device is a photocell.
Claim 6
Dependent Claim
49 words
The apparatus defined in claim 4, in which said directing means is positioned between said source and said vessel and comprises a partially reflective member capable of passing radIations from said source to said vessel and of further reflecting the reflected radiations from said vessel onto said radiation-sensing device.
Claim 7
Dependent Claim
30 words
The apparatus defined in claim 4, in which said reflective member is composed of retroreflective material capable of reflecting rays incident thereon directly back along the paths of incidence thereof.
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) | 1974-12-20 | 1975-06-21 | 1975-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-20 | 1979-06-21 | 1979-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-20 | 1983-06-21 | 1983-12-21 | $7700.00 | Window Closed / Lapsed |