US4110739A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Means for detecting leakage in the inner lining of tanks and piping
Assignee: Individual
•
Filing: 1976-08-02
•
Granted: 1978-08-29
•
Expires: 1996-08-02
Abstract
Abstract A laminated vessel or pipe having an outer wall of fibreglass reinforced polyester, an inner wall of corrosion resistant thermoplastic and an electrical conductive layer between the inner and outer walls. A probe of inert material is inserted into the tank or pipe and is connected to a source of electrical power and with an alarm system and the electrical circuit is completed with a connection to the electrical conductive layer in the vessel or pipe.
Inventors
- 👤 John A. Kidd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:51
CPC Classifications
G; G01; G01M; G01M3/00; G01M3/40; B; B65; B65D; B65D90/00; B65D90/48; B65D90/50; B65D90/513; G01M3/02; G01M3/04; G01M3/16; G01M3/18; G01M3/186
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
127 words
A vessel for containing liquid chemicals, the said vessel having a laminate wall structure, including an outer structural wall of fibreglass reinforced polyester, an inner corrosion resistant thermoplastic barrier and an electrical conductive layer constructed of finely divided particles contained in a glass mat, said finely divided particles being selected from the group consisting of metals, carbon and graphite, the said conductive layer positioned between the said outer structural wall and the said inner corrosion resistant barrier, an electrical conductive probe extending into the liquid containing interior of the vessel, and an alarm means electrically connected between the probe and the conductive layer and adapted to be activated when the inner corrosion resistant barrier of the vessel is penetrated by the liquid chemical stored within the vessel.
Claim 2
Dependent Claim
127 words
A vessel for containing liquid chemicals, the said vessel having a laminate wall structure, including an outer structural wall of fibreglass reinforced polyester, an inner corrosion resistant thermoplastic barrier and an electrical conductive layer constructed of finely divided particles contained in a glass mat, said finely divided particles being selected from the group consisting of metals, carbon and graphite, the said conductive layer positioned between the said outer structural wall and the said inner corrosion resistant barrier, an electrical conductive probe extending into the liquid containing interior of the vessel, and an alarm means electrically connected between the probe and the conductive layer and adapted to be activated when the inner corrosion resistant barrier of the vessel is penetrated by the liquid chemical stored within the vessel.
Claim 3
Dependent Claim
24 words
A vessel of the type set forth in claim 1 in which the laminated wall structure includes an inner and outer veil of fibreglass.
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) | 1981-08-28 | 1982-02-27 | 1982-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-08-28 | 1986-02-27 | 1986-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-08-28 | 1990-02-27 | 1990-08-29 | $7700.00 | Window Closed / Lapsed |