US2704178A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extensible ladder
Assignee: WIKSTRAND AND BERG AB
•
Filing: 1949-03-03
•
Granted: 1955-03-15
•
Expires: 1969-03-03
Abstract
No abstract record available.
Inventors
- 👤 Nilsson Gustav Ragnar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 23:55
CPC Classifications
E; E06; E06C; E06C7/00; E06C7/18; E06C7/181; E06C7/183; E06C1/00; E06C1/02; E06C1/04; E06C1/08; E06C1/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US659310A
Cited
US891242A
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US2037860A
Cited
US1898456A
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US2153362A
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US2127035A
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US2228525A
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US2277392A
Cited
US2388415A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-03-14 | 1958-09-13 | 1959-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-03-14 | 1962-09-13 | 1963-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-03-14 | 1966-09-13 | 1967-03-15 | $7700.00 | Window Closed / Lapsed |