Patent US3062529A successfully refreshed from Google Patents.
US3062529A
Expired / Lapsed
US
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Apparatus for constructing stairs
Assignee: Dravo Corp
•
Filing: 1960-01-08
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Granted: 1962-11-06
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Expires: 1980-01-08
Abstract
No abstract record available.
Inventors
- 👤 Robert W Hiller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:32
CPC Classifications
E; E04; E04F; E04F21/00; E04F21/26
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1618536A
Cited
US1745471A
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US1753051A
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US2030594A
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US2234906A
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US2588810A
Cited
US2648896A
Cited
US2787825A
Cited
US2870531A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-11-05 | 1966-05-07 | 1966-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-11-05 | 1970-05-07 | 1970-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-11-05 | 1974-05-07 | 1974-11-06 | $7700.00 | Window Closed / Lapsed |