US4398084A
Expired / Lapsed
US
⏱️ 0.0 years remaining
End seal for strip heaters
Assignee: Raychem Corp
•
Filing: 1981-06-15
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Granted: 1983-08-09
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Expires: 2001-06-15
Abstract
Abstract A method and apparatus for sealing the end of a conductive polymeric strip heater, especially one for immersion use, greatly reduces the possibility of failure due to fluid ingress.
Inventors
- 👤 Robert J. Walty
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:25
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/02; H05B3/06; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49082; Y10T29/49083
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
65 words
A conductive polymeric strip heater, which comprises at least two elongate electrodes embedded in a a strip of a conductive polymeric composition, one end of said heater having been cut to length and then sealed by extruding an end portion of said strip of conductive polymeric composition to cover the cut ends of said electrodes and to reduce the cross-sectional area of said end portion.
Claim 2
Dependent Claim
65 words
A conductive polymeric strip heater, which comprises at least two elongate electrodes embedded in a a strip of a conductive polymeric composition, one end of said heater having been cut to length and then sealed by extruding an end portion of said strip of conductive polymeric composition to cover the cut ends of said electrodes and to reduce the cross-sectional area of said end portion.
Claim 3
Dependent Claim
17 words
The heater of claim 1 which further comprises a polymeric end cap placed about the sealed end.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-08-08 | 1987-02-07 | 1987-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-08 | 1991-02-07 | 1991-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-08 | 1995-02-07 | 1995-08-09 | $7700.00 | Window Closed / Lapsed |