Patent US3349762A successfully refreshed from Google Patents.
US3349762A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blood flow indicator and process
Assignee: Optics Tech Inc
•
Filing: 1964-10-21
•
Granted: 1967-10-31
•
Expires: 1984-10-21
Abstract
No abstract record available.
Inventors
- 👤 Narinder S Kapany
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:34
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/02; A61B5/026; A61B5/0261; G; G01; G01F; G01F1/00; G01F1/66; G01F1/661
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
134 words
A METHOD FOR OBTAINING THE VELOCITY OF BLOOD FLOWING WITHIN A BLOOD VESSEL COMPRISING THE STEPS OF: DETERMINING THE WAVE LENGTH OF LIGHT THAT EXHIBITS MINIMUM VARIATION IN TRANSMISSION OR REFLECTION FROM CHANGES IN OXYGEN CONTENT OF THE FLOWING BLOOD; INSERTING FIRST AND SECOND FIBER OPTICAL PATHS INTO SAID BLOOD VESSEL, SAID PATH TERMINATING IN OPTICAL COMMUNICATION WITH SAID FLOWING BLOOD; DIRECTING LIGHT OF A WAVE LENGTH IN SUBSTANTIAL CONFORMANCE WITH SAID DETERMINED WAVE LENGTH ALONG SAID FIRST OPTICAL PATH INTO OPTICAL COMMUNICATION WITH SAID FLOWING BLOOD; MEASURING THE INTENSITY OF SAID LIGHT THAT PASSES FROM SAID FLOWING BLOOD INTO OPTICAL COMMUNICATION WITH SAID SECOND OPTICAL PATH; CONVERTING THE MEASURED INTENSITY OF SAID COMMUNICATED LIGHT TO AN ELECTRICAL SIGNAL; AND DETERMINING THE VELOCITY OF THE FLOWING BLOOD FROM THE AMPLITUDE OF THE ELECTRICAL SIGNAL.
Claim 2
Independent Claim
134 words
A METHOD FOR OBTAINING THE VELOCITY OF BLOOD FLOWING WITHIN A BLOOD VESSEL COMPRISING THE STEPS OF: DETERMINING THE WAVE LENGTH OF LIGHT THAT EXHIBITS MINIMUM VARIATION IN TRANSMISSION OR REFLECTION FROM CHANGES IN OXYGEN CONTENT OF THE FLOWING BLOOD; INSERTING FIRST AND SECOND FIBER OPTICAL PATHS INTO SAID BLOOD VESSEL, SAID PATH TERMINATING IN OPTICAL COMMUNICATION WITH SAID FLOWING BLOOD; DIRECTING LIGHT OF A WAVE LENGTH IN SUBSTANTIAL CONFORMANCE WITH SAID DETERMINED WAVE LENGTH ALONG SAID FIRST OPTICAL PATH INTO OPTICAL COMMUNICATION WITH SAID FLOWING BLOOD; MEASURING THE INTENSITY OF SAID LIGHT THAT PASSES FROM SAID FLOWING BLOOD INTO OPTICAL COMMUNICATION WITH SAID SECOND OPTICAL PATH; CONVERTING THE MEASURED INTENSITY OF SAID COMMUNICATED LIGHT TO AN ELECTRICAL SIGNAL; AND DETERMINING THE VELOCITY OF THE FLOWING BLOOD FROM THE AMPLITUDE OF THE ELECTRICAL SIGNAL.
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) | 1970-10-30 | 1971-05-01 | 1971-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-30 | 1975-05-01 | 1975-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-30 | 1979-05-01 | 1979-10-31 | $7700.00 | Window Closed / Lapsed |