US2913136A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Junction box for underfloor conduit and duct systems for cellular floors
Assignee: HK Porter Co Inc
•
Filing: 1957-01-29
•
Granted: 1959-11-17
•
Expires: 1977-01-29
Abstract
No abstract record available.
Inventors
- 👤 Johnson Robert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:13
CPC Classifications
E; E04; E04F; E04F19/00; E04F19/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2735166A
Cited
US788880A
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US1533759A
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US1949883A
Cited
US2043648A
Cited
US2063569A
Cited
US2657250A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-11-16 | 1963-05-18 | 1963-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-11-16 | 1967-05-18 | 1967-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-11-16 | 1971-05-18 | 1971-11-17 | $7700.00 | Window Closed / Lapsed |