Patent US4043836A successfully refreshed from Google Patents.
Patent US2473909A successfully refreshed from Google Patents.
US2473909A
Expired / Lapsed
US
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Duct element, intended in particular for laying electric cables
Assignee: Individual
•
Filing: 1947-04-16
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Granted: 1949-06-21
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Expires: 1967-04-16
Abstract
No abstract record available.
Inventors
- 👤 Ruchti Charles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:29
CPC Classifications
E; E03; E03F; E03F3/00; E03F3/04; F; F16; F16L; F16L25/00; F16L25/0018; H; H02; H02G; H02G9/00; H02G9/06; H02G9/065
Claims Analysis
Total Claims: 0
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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) | 1952-06-20 | 1952-12-20 | 1953-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-06-20 | 1956-12-20 | 1957-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-06-20 | 1960-12-20 | 1961-06-21 | $7700.00 | Window Closed / Lapsed |