US2907401A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Folding stairs
Assignee: Individual
•
Filing: 1957-10-23
•
Granted: 1959-10-06
•
Expires: 1977-10-23
Abstract
No abstract record available.
Inventors
- 👤 Wagner Johann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:01
CPC Classifications
E; E06; E06C; E06C1/00; E06C1/52; E06C1/54; E04; E04F; E04F11/00; E04F11/02; E04F11/04; E04F11/06; E04F11/062; E04F11/066
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US427771A
Cited
US1870603A
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US876354A
Cited
US1930992A
Cited
US2050593A
Cited
CH181741A
Cited
US2122040A
Cited
US2203086A
Cited
US2572281A
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 |