US2491700A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Braced conduit construction
Assignee: Individual
•
Filing: 1945-11-10
•
Granted: 1949-12-20
•
Expires: 1965-11-10
Abstract
No abstract record available.
Inventors
- 👤 Zwerling Harry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:03
CPC Classifications
F; F24; F24F; F24F13/00; F24F13/02; F24F13/0209; F16; F16L; F16L23/00; F16L23/12; F16L23/14; F16L3/00; F16L3/006
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1664885A
Cited
US1693428A
Cited
US1828105A
Cited
US2161997A
Cited
US760216A
Cited
US984086A
Cited
US976029A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-12-19 | 1953-06-20 | 1953-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-12-19 | 1957-06-20 | 1957-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-12-19 | 1961-06-20 | 1961-12-20 | $7700.00 | Window Closed / Lapsed |