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Patent US3528456A successfully refreshed from Google Patents.
US3528456A
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Coaxial tubular members spaced with insulating spacer means
Assignee: KM Kabelmetal AG
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Filing: 1969-01-08
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Granted: 1970-09-15
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Expires: 1989-01-08
Abstract
No abstract record available.
Inventors
- 👤 Ernst Scheffler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:42
CPC Classifications
F; F16; F16L; F16L59/00; F16L59/12; H; H01; H01B; H01B12/00; H01B12/14; Y; Y02; Y02E; Y02E40/00; Y02E40/60
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USRE23545E
Cited
DE647150C
Cited
GB538119A
Cited
DE905992C
Cited
GB1083185A
Cited
US3332446A
Cited
US3296688A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-09-14 | 1974-03-16 | 1974-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-09-14 | 1978-03-16 | 1978-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-09-14 | 1982-03-16 | 1982-09-15 | $7700.00 | Window Closed / Lapsed |