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US2535501A
Expired / Lapsed
US
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Escalator step tread and guide
Assignee: Individual
•
Filing: 1948-10-06
•
Granted: 1950-12-26
•
Expires: 1968-10-06
Abstract
No abstract record available.
Inventors
- 👤 Robert F Loughridge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:49
CPC Classifications
B; B66; B66B; B66B23/00; B66B23/14; B66B23/145
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US829152A
Cited
US1257144A
Cited
US1561668A
Cited
US1811508A
Cited
US1984801A
Cited
US2214580A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-12-25 | 1954-06-26 | 1954-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-12-25 | 1958-06-26 | 1958-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-12-25 | 1962-06-26 | 1962-12-26 | $7700.00 | Window Closed / Lapsed |