US4120325A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrically conducting plastic pipe system
Assignee: Wavin BV
•
Filing: 1976-01-07
•
Granted: 1978-10-17
•
Expires: 1996-01-07
Abstract
Abstract A conducting plastic pipe system comprising a male plastic pipe part and a female plastic pipe part with conducting covering layers which are interconnected by means of a conducting sealing ring between the male and female part. In case of outer covering layers on the pipe part the covering layer extends onto the inner side of the muff end of the female pipe part.
Inventors
- 👤 Warner Jan de Putter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:57
CPC Classifications
F; F16; F16L; F16L9/00; F16L9/12; F16L9/125; F16L25/00; F16L25/01; Y; Y10; Y10S; Y10S285/00; Y10S285/918
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
73 words
A polyvinylchloride pipe having an inner and outer surface characterized in that one of said surfaces is provided with a continuous coating layer of a thermosetting modified epoxy material which is fully connected with the surface of the pipe and adheres thereto, the thermosetting coating containing a quantity of soot-like conducting carbon particles so that the thermosetting coating layer is electrically conductive, the coating being connectible with means for discharging the electric charges.
Claim 2
Dependent Claim
73 words
A polyvinylchloride pipe having an inner and outer surface characterized in that one of said surfaces is provided with a continuous coating layer of a thermosetting modified epoxy material which is fully connected with the surface of the pipe and adheres thereto, the thermosetting coating containing a quantity of soot-like conducting carbon particles so that the thermosetting coating layer is electrically conductive, the coating being connectible with means for discharging the electric charges.
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) | 1981-10-16 | 1982-04-17 | 1982-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-16 | 1986-04-17 | 1986-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-16 | 1990-04-17 | 1990-10-17 | $7700.00 | Window Closed / Lapsed |