US3734629A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Instrument for determining the optical density of fluids
Assignee: Individual
•
Filing: 1971-06-22
•
Granted: 1973-05-22
•
Expires: 1991-06-22
Abstract
Abstract A rod or tube made of an inert material into a part of which the fluid to be tested can enter and in which are embedded a light source and a photo-electric cell arranged so that light from the source passes through the fluid and actuates the cell.
Inventors
- 👤 V Griffiths
- 👤 R Howes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:01
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/84; G01N21/85; G01N21/8507
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
177 words
An instrument for determining the optical density of a fluid comprising an elongated rod having a first free end, and a second end opposite said free end, said rod having an integral, coaxial tubular portion extending therethrough from adjacent said free end toward said opposite end but terminating at a point spaced from said opposite end, said tubular portion having a wall encircling a cavity for receiving said fluid therein and having an opening at the end thereof adjacent said free end for admitting said fluiD into said cavity, a lamp embedded in said rod adjacent said opposite end thereof, light transmitting means extending from said lamp to said cavity for transmitting light from said lamp to said cavity and in a rectilinear path across a portion of said cavity and at least one light responsive cell embedded in said tubular portion adjacent said cavity and in said path for receiving light transmitted across said portion of said cavity and hence, through fluid contained therein and producing as electrical signal indicative of the density of said fluid.
Claim 2
Dependent Claim
177 words
An instrument for determining the optical density of a fluid comprising an elongated rod having a first free end, and a second end opposite said free end, said rod having an integral, coaxial tubular portion extending therethrough from adjacent said free end toward said opposite end but terminating at a point spaced from said opposite end, said tubular portion having a wall encircling a cavity for receiving said fluid therein and having an opening at the end thereof adjacent said free end for admitting said fluiD into said cavity, a lamp embedded in said rod adjacent said opposite end thereof, light transmitting means extending from said lamp to said cavity for transmitting light from said lamp to said cavity and in a rectilinear path across a portion of said cavity and at least one light responsive cell embedded in said tubular portion adjacent said cavity and in said path for receiving light transmitted across said portion of said cavity and hence, through fluid contained therein and producing as electrical signal indicative of the density of said fluid.
Claim 3
Dependent Claim
31 words
An instrument as set forth in claim 1, wherein said opening extends from said free end to said cavity, whereby said cavity is open in a direction longitudinally of said rod.
Claim 4
Dependent Claim
42 words
An instrument as set forth in claim 2, wherein said rod further comprises at least one air vent extending from a surface thereof spaced from said free end to a portion of said cavity spaced from said free end of said rod.
Claim 5
Dependent Claim
46 words
An instrument as set forth in claim 3, wherein said cell has a light receiving face and is mounted with such face at a wall of said cavity which extends longitudinally of said rod and with such face facing transversely of the length of said rod.
Claim 6
Dependent Claim
76 words
An instrument as set forth in claim 4, wherein said light transmitting means projects light centrally of said cavity and further comprising a second light responsive cell embedded in said tubular portion of said rod and having a light receiving face, said second cell being mounted with said face thereof at a portion of the wall of said cavity which is opposite from the side thereof at which said face of said first-mentioned cell is mounted.
Claim 7
Dependent Claim
64 words
An instrument as set forth in claim 4, wherein said light transmitting means extends to a point adjacent a sidewall of said cavity extending longitudinally of said rod and which is spaced from said light receiving face and said light transmitting means comprises a light reflector at said point and mounted to reflect light from said means across said cavity and onto said face.
Claim 8
Dependent Claim
138 words
An instrument as set forth in claim 1, wherein said tubular portion is closed by an end wall at said free end and said opening extends through said first-mentioned wall in a direction transverse to the length of said rod and to the portion of said cavity adjacent said end wall and said rod has an air vent extending from a surface thereof spaced from said free end and said end wall to a portion of said cavity spaced from said end wall and said opening, wherein said cell is embedded in said end wall and is mounted to receive light transmitted longitudinally of said rod across said cavity and wherein said light transmitting means transmits light longitudinally of said rod across said cavity and from a portion of the latter spaced from said cell to said cell.
References Cited (Backward Citations)
US2203720A
Cited
US2324304A
Cited
US2682800A
Cited
US3263553A
Cited
US3383979A
Cited
US3551670A
Cited
US3586862A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-21 | 1976-11-20 | 1977-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-21 | 1980-11-20 | 1981-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-21 | 1984-11-20 | 1985-05-22 | $7700.00 | Window Closed / Lapsed |