Patent US3177757A successfully refreshed from Google Patents.
US3177757A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of performing reflective oximetry
Assignee: American Optical Corp
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Filing: 1960-03-29
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Granted: 1965-04-13
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Expires: 1980-03-29
Abstract
No abstract record available.
Inventors
- 👤 Michael L Polanyi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:57
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/25; G01N21/31; G01N21/314
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
137 words
THE METHOD OF DETERMINING AN ABSOLUTE VALUE OF OXYGEN SATURATION OF AN UNHEMOLYZED BLOOD SPECIMEN COMPRISING DIRECTING LIGHT ALONG AN OPTICAL PATH ONTO A SURFACE OF THE BLOOD OF SAID SPECIMEN IN SUCH MANNER AS TO CAUSE A SUBSTANTIAL AMOUNT OF SIAD LIGHT TO BE REFLECTED BY SAID SPECIMEN, SELECTIVELY FILTERING A FIRST PORTION OF SAID RELECTED LIGHT TO REMOVE SUBSTANTIALLY ALL WAVELENGTHS THEREFROM BUT A FIRST PRESELECTED WAVELENGTH OF LIGHT CORRESPONDING TO AN ISOBESTIC POINT WHERE OXYHEMOGLOBIN AND REDUCED HEMOGLOBIN IN SIAD BLOOD SPECIMEN HAVE SUBSTANTIALLY EQUAL EXTINCTION COEFFICIENTS FOR SAID PRESELECTED WAVELENGTH, SELECTIVELY FILTERING A SECOND PORTION OF SAID REFLECTED LIGHT TO REMOVE SUBSTANTIALLY ALL WAVELENGTHS THEREFROM BUT A PRESELECTED SECOND WAVELENGTH OF LIGH FOR WHICH SAID OXYHEMOGLOBIN AND REDUCED HEMOGLOBIN HAVE APPRECIABLY DIFFERENT EXTINCTION COEFFICIENTS, MEASURING THE RATIO OF INTENSITY OF ONE OF SAID
Claim 2
Independent Claim
137 words
THE METHOD OF DETERMINING AN ABSOLUTE VALUE OF OXYGEN SATURATION OF AN UNHEMOLYZED BLOOD SPECIMEN COMPRISING DIRECTING LIGHT ALONG AN OPTICAL PATH ONTO A SURFACE OF THE BLOOD OF SAID SPECIMEN IN SUCH MANNER AS TO CAUSE A SUBSTANTIAL AMOUNT OF SIAD LIGHT TO BE REFLECTED BY SAID SPECIMEN, SELECTIVELY FILTERING A FIRST PORTION OF SAID RELECTED LIGHT TO REMOVE SUBSTANTIALLY ALL WAVELENGTHS THEREFROM BUT A FIRST PRESELECTED WAVELENGTH OF LIGHT CORRESPONDING TO AN ISOBESTIC POINT WHERE OXYHEMOGLOBIN AND REDUCED HEMOGLOBIN IN SIAD BLOOD SPECIMEN HAVE SUBSTANTIALLY EQUAL EXTINCTION COEFFICIENTS FOR SAID PRESELECTED WAVELENGTH, SELECTIVELY FILTERING A SECOND PORTION OF SAID REFLECTED LIGHT TO REMOVE SUBSTANTIALLY ALL WAVELENGTHS THEREFROM BUT A PRESELECTED SECOND WAVELENGTH OF LIGH FOR WHICH SAID OXYHEMOGLOBIN AND REDUCED HEMOGLOBIN HAVE APPRECIABLY DIFFERENT EXTINCTION COEFFICIENTS, MEASURING THE RATIO OF INTENSITY OF ONE OF SAID
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) | 1968-04-12 | 1968-10-12 | 1969-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-04-12 | 1972-10-12 | 1973-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-04-12 | 1976-10-12 | 1977-04-13 | $7700.00 | Window Closed / Lapsed |