Patent US2907402A successfully refreshed from Google Patents.
US2907402A
Expired / Lapsed
US
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Portable steps
Assignee: Individual
•
Filing: 1956-10-24
•
Granted: 1959-10-06
•
Expires: 1976-10-24
Abstract
No abstract record available.
Inventors
- 👤 Francis B Lewis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:11
CPC Classifications
E; E06; E06C; E06C7/00; E06C7/08; E06C7/081; B; B61; B61D; B61D23/00; E06C5/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US297822A
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US367974A
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US1836453A
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US2129999A
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US2105565A
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US2388892A
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US2510515A
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US2551345A
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GB718337A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-10-05 | 1963-04-06 | 1963-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-10-05 | 1967-04-06 | 1967-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-10-05 | 1971-04-06 | 1971-10-06 | $7700.00 | Window Closed / Lapsed |