US2552630A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metal ladder
Assignee: Individual
•
Filing: 1947-08-06
•
Granted: 1951-05-15
•
Expires: 1967-08-06
Abstract
No abstract record available.
Inventors
- 👤 Henry M Hutchinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:37
CPC Classifications
E; E06; E06C; E06C7/00; E06C7/08; E06C7/082; E06C7/083; E06C7/085
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US709118A
Cited
US1133138A
Cited
US1591550A
Cited
GB303028A
Cited
US2153127A
Cited
US2303078A
Cited
US2469559A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-05-14 | 1954-11-13 | 1955-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-14 | 1958-11-13 | 1959-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-14 | 1962-11-13 | 1963-05-15 | $7700.00 | Window Closed / Lapsed |