US4782709A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnetic flowmeter
Assignee: Azbil Corp
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Filing: 1986-07-25
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Granted: 1988-11-08
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Expires: 2006-07-25
Abstract
Abstract In an electromagnetic flowmeter using a ceramic pipe as a measuring pipe, an electrode inserted in the ceramic pipe includes a ceramic core rod and a conductive portion of a refractory metal. The conductive portion covers a fluid contact end face of the core rod and extends along the longitudinal direction of the core rod. The other end of the conductive portion faces an outer surface of the ceramic pipe, and is opposite the fluid contact end face.
Inventors
- 👤 Tsutomu Goto
- 👤 Yoshiro Tanaka
- 👤 Sakae Ishikawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:34
CPC Classifications
G; G01; G01D; G01D5/00; G01D5/12; G01D5/14; G01F; G01F1/00; G01F1/56; G01F1/58; G01F1/584
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
86 words
An electromagnetic flowmeter comprising: a ceramic main member having a hollow interior and an electrode aperture; and an electrode directly secured within said electrode aperture and forming a shrink-fitted fluid tight seal therewith, said electrode comprising a ceramic core member having a first end exposed to said hollow interior and a second end and a conductive member fabricated from a refractory metal, said conductive member covering substantially all of said first end of said core member and extending toward said second end of said core member.
Claim 2
Dependent Claim
86 words
An electromagnetic flowmeter comprising: a ceramic main member having a hollow interior and an electrode aperture; and an electrode directly secured within said electrode aperture and forming a shrink-fitted fluid tight seal therewith, said electrode comprising a ceramic core member having a first end exposed to said hollow interior and a second end and a conductive member fabricated from a refractory metal, said conductive member covering substantially all of said first end of said core member and extending toward said second end of said core member.
Claim 3
Dependent Claim
26 words
A flowmeter according to claim 1, wherein said conductive member covers said first end of said core member and the outer surface of said core member.
Claim 4
Dependent Claim
24 words
A flowmeter according to claim 2, further including a conductive head mounted on said conductive member adjacent said first end of said core member.
Claim 5
Dependent Claim
24 words
A flowmeter according to claim 2, further including a conductive cap mounted on said conductive member adjacent said first end of said core member.
Claim 6
Dependent Claim
25 words
A flowmeter according to claim 2, wherein said first end of said core member has a smaller width than that of the remaining portion thereof.
Claim 7
Dependent Claim
25 words
A flowmeter according to claim 2, wherein said first end of said core member has a larger width than that of the remaining portion thereof.
Claim 8
Dependent Claim
32 words
A flowmeter according to claim 1, wherein said conductive member terminates adjacent said second end of said core member and is provided with a terminal portion connected to a signal lead wire.
Claim 9
Dependent Claim
29 words
A flowmeter according to claim 7, wherein said terminal portion is formed on an outer surface of said conductive member adjacent the outer surface of said ceramic main member.
Claim 10
Dependent Claim
40 words
A flowmeter according to claim 7, wherein said second end of said core member is located adjacent the outer surface of said ceramic main member, and wherein said terminal portion is located adjacent said second end of said core member.
Claim 11
Dependent Claim
57 words
A flowmeter according to claim 1, wherein said conductive member extends beyond said second end of said core member and above the outer surface of said ceramic main member; and wherein said conductive member is provided with a terminal portion located above the outer surface of said ceramic main member and connected to a signal lead wire.
Claim 12
Dependent Claim
42 words
A flowmeter according to claim 1, wherein said core member comprises a cylinder having a hollow interior and wherein said conductive member extends from said first end of said core member through said hollow interior of said cylinder toward said second end.
Claim 13
Dependent Claim
32 words
A flowmeter according to claim 11, wherein a recess is formed in said first end of said core member, and wherein a portion of said conductive member is located in said recess.
Claim 14
Dependent Claim
19 words
A flowmeter according to claim 11, wherein said conductive portion covers the entire first end of said core member.
Claim 15
Dependent Claim
32 words
A flowmeter according to claim 12, wherein the portion of said conductive member located in said recess forms a second recess, and wherein a conductive tip is located in said second recess.
Claim 16
Dependent Claim
21 words
A flowmeter according to claim 11, wherein said conductive member occupies substantially all of said hollow interior of said core member.
Claim 17
Dependent Claim
20 words
A flowmeter according to claim 11, further including a conductive cap mounted to said first end of said core member.
Claim 18
Dependent Claim
44 words
A flowmeter according to claim 15, wherein said conductive member has a hollow central portion opening outwardly with respect to said ceramic main member, and wherein one end of a signal lead wire is received in said hollow central portion of said conductive member.
Claim 19
Dependent Claim
45 words
A flowmeter according to claim 15, wherein said conductive member has a hollow central portion opening outwardly with respect to said ceramic main member, and wherein a terminal connected to a signal lead wire is received in said hollow central portion of said conductive member.
Claim 20
Dependent Claim
27 words
A flowmeter according to claim 11, wherein said conductive member includes a lock portion formed in the interior thereof for receiving a plug or jack insertable therein.
Claim 21
Dependent Claim
23 words
A flowmeter according to claim 11, wherein said first end of said core member has a larger width than the remaining portions thereof.
Claim 22
Dependent Claim
19 words
A flowmeter according to claim 20, wherein said conductive member covers the entire first end of said core member.
Claim 23
Dependent Claim
24 words
A flowmeter according to claim 21, further including a conductive tip coupled to said conductive member adjacent said first end of said core member.
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) | 1991-11-08 | 1992-05-09 | 1992-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-08 | 1996-05-09 | 1996-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-08 | 2000-05-09 | 2000-11-08 | $7700.00 | Window Closed / Lapsed |