US2773513A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Subterranean insulated conduit unit having spacer channel between pipes
Assignee: Individual
•
Filing: 1953-12-22
•
Granted: 1956-12-11
•
Expires: 1973-12-22
Abstract
No abstract record available.
Inventors
- 👤 Alexander H Isenberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:58
CPC Classifications
F; F16; F16L; F16L59/00; F16L59/14; F16L59/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US528291A
Cited
FR572942A
Cited
US1799672A
Cited
US2330966A
Cited
US2347855A
Cited
US2532587A
Cited
US2664112A
Cited
US2545030A
Cited
US2650801A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-12-11 | 1960-06-11 | 1960-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-12-11 | 1964-06-11 | 1964-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-12-11 | 1968-06-11 | 1968-12-11 | $7700.00 | Window Closed / Lapsed |