Patent US3691833A successfully refreshed from Google Patents.
US3691833A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for detecting velocity of gas thermoelectrically
Assignee: Toyota Central R&D Labs Inc
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Filing: 1970-08-26
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Granted: 1972-09-19
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Expires: 1990-08-26
Abstract
Abstract The miniaturized device for detecting velocity of gas thermoelectrically has a heating wire supported by a pair of metal rods and extending thereacross and two thermocouples of chromel-alumel bimetallics which have one wire common to both such wire having one end conductively connected to the heating wire at a point near or equal to the center of the heating wire. Different but closely related connecting junctions are possible. This configuration permits accurate measurement of the speed of gas streams, without interference from e.m.f. signal distortions.
Inventors
- 👤 Kenji Fujikake
- 👤 Norio Mutoh
- 👤 Yuji Yagi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:47
CPC Classifications
G; G01; G01F; G01F1/00; G01F1/68; G01F1/684; G01F1/688; G01F1/6888
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
218 words
A device for thermoelectrically detecting the velocity of a gas, for use in conjunction with a source of energy and with indicating and measuring means, said device comprising: a pair of metallic supports adapted to be connected to the source of energy, said supports being spaced apart from each other and each having a first end and a second end; said first ends being bevelled and said second ends being bundled together and electrically insulated from each other; an electrical heating wire extending across said first ends and conductively connected thereto; a first thermocouple comprising a first wire and a second wire, said first and second wires being of a different metal composition, one end of said first and second wIres being conductively connected to each other proximate the central region of said heating wire; a second thermocouple comprising said second wire of said first thermocouple and a third wire, said second and third wires being of a different metal composition, said first and third wires being of same metal composition, one end of said second and third wires being conductively connected to each other; the ends of said first and third wires which are not connected to said second wire and serve as output terminals being adapted to be conductively connected to the indicating and measuring means.
Claim 2
Independent Claim
218 words
A device for thermoelectrically detecting the velocity of a gas, for use in conjunction with a source of energy and with indicating and measuring means, said device comprising: a pair of metallic supports adapted to be connected to the source of energy, said supports being spaced apart from each other and each having a first end and a second end; said first ends being bevelled and said second ends being bundled together and electrically insulated from each other; an electrical heating wire extending across said first ends and conductively connected thereto; a first thermocouple comprising a first wire and a second wire, said first and second wires being of a different metal composition, one end of said first and second wIres being conductively connected to each other proximate the central region of said heating wire; a second thermocouple comprising said second wire of said first thermocouple and a third wire, said second and third wires being of a different metal composition, said first and third wires being of same metal composition, one end of said second and third wires being conductively connected to each other; the ends of said first and third wires which are not connected to said second wire and serve as output terminals being adapted to be conductively connected to the indicating and measuring means.
Claim 3
Dependent Claim
41 words
The device according to claim 1, wherein said one end of said first wire and said one end of said third wire are conductively connected to said heating wire at points intermediate its ends and in close proximity to each other.
Claim 4
Dependent Claim
50 words
The device according to claim 1, wherein said one end of said third wire is conductively connected to said heating wire at point substantially intermediate its ends and said one end of said first wire is conductively connected to said third wire at a point proximate said one end thereof.
Claim 5
Dependent Claim
51 words
The device according to claim 1, wherein said one end of said first wire is conductively connected to said heating wire at a point substantially intermediate its ends and said one end of said third wire is conductively connected to said first wire at a point proximate said one end thereof.
Claim 6
Dependent Claim
44 words
The device according to claim 1, wherein said heating wire is conductively connected to said third wire at a point near said one end thereof and said one end of said first wire is conductively connected to said one end of said third wire.
Claim 7
Dependent Claim
44 words
The device according to claim 1, wherein said heating wire is conductively connected to said first wire at a point near said one end thereof and said one end of said third wire is conductively connected to said one end of said first wire.
Claim 8
Dependent Claim
15 words
The device according to claim 1, wherein said pair of metallic supports are metal rods.
Claim 9
Dependent Claim
45 words
The device according to claim 7, wherein the ends of said first and third wires are connected to the indicating and measuring means through another pair of metal rods bundled together with said first mentioned metal rods and electrically insulated therefrom and from each other.
Claim 10
Dependent Claim
110 words
The device according to claim 8, wherein forward portions of said first mentioned metal rods are so bent that they run parallel and opposite to each other in a common plane and are spaced a predetermined constant distance apart; and wherein one of said second mentioned metal rods extends upwardly to a position midway between the bends of the first mentioned metal rods, while the top end of the other of said second mentioned metal rods is bent to extend out of the plane which includes said forward portions of said first mentioned metal rods and in a direction transverse to the direction in which said forward portions are bent.
Claim 11
Dependent Claim
38 words
The device according to claim 9, wherein said first and said second mentioned metal rods are formed of Phosphor Bronze; said heating wire is Nichrome; said first and third wires are Chromel; and said second wire is Alumel.
Claim 12
Dependent Claim
138 words
The device according to claim 8, wherein said first mentioned metal rods are bifurcated at a predetermined distance from the respective ends thereof; the terminal parts of forward portions thereof being substantially parallel to shank portions thereof; the forward end of one of said second mentioned metal rods terminating near the bifurcation of said shank portions; and the forward end of the other of said second mentioned metal rods being formed with a bevelled end face and extending with a gentle curve to a position beyond said heating wire; and said last mentioned metal rod being laterally spaced from the plane which includes said forward portions of said first mentioned metal rods and said heating wire, and being positioned on the opposite side of said plane with its forward end lying in a plane normal to said plane.
Claim 13
Dependent Claim
40 words
The device according to claim 11, wHerein said first mentioned metal rods are Phosphor Bronze; said second mentioned metal rods are Chromel; said heating wire is Nichrome; said first and third wires are Chromel; and said second wire is Alumel.
Claim 14
Dependent Claim
15 words
The device according to claim 1, wherein said pair of metallic supports are tubular conduits.
Claim 15
Dependent Claim
43 words
The device according to claim 13, wherein the ends of said first and third wires are connected to the indicating and measuring means through a pair of metal rods bundled together with said tubular conduits and electrically insulated therefrom and from each other.
Claim 16
Dependent Claim
100 words
The device according to claim 14, wherein forward portions of said tubular conduits are so bent that they run parallel and opposite to each other in a common plane and are spaced a predetermined constant distance apart; and wherein one of said metal rods extends upwardly to a position midway between the bends of said tubular conduits, while the top end of the other of said metal rods is bent to extend out of the plane which includes said forward portions of said tubular conduits and in a direction transverse to the direction in which said forward portions are bent.
Claim 17
Dependent Claim
31 words
The device according to claim 15, wherein said tubular conduits are stainless steel; said metal rods are Chromel; said first and third wires are Chromel; and said second wire is Alumel.
Claim 18
Dependent Claim
51 words
The device according to claim 13, wherein a junction point of said first thermocouple is located substantially on the central part of said heating wire, and a junction point of said second thermocouple is located forwardly of said heating wire in the longitudinal direction of forward portions of said tubular conduits.
Claim 19
Dependent Claim
31 words
The device according to claim 17, wherein said tubular conduits are stainless steel; said heating wire is Nichrome; said first and third wires are Chromel; and said second wire is Alumel.
Claim 20
Dependent Claim
32 words
The device according to claim 1, wherein a junction point of said second thermocouple is located forwardly of said heating wire in the longitudinal direction of forward portions of said metallic supports.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-19 | 1976-03-20 | 1976-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-19 | 1980-03-20 | 1980-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-19 | 1984-03-20 | 1984-09-19 | $7700.00 | Window Closed / Lapsed |