Patent US2003780A successfully refreshed from Google Patents.
US3608256A
Expired / Lapsed
US
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Step construction
Assignee: Reynolds Metals Co
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Filing: 1969-10-15
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Granted: 1971-09-28
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Expires: 1989-10-15
Abstract
Abstract THIS DISCLOSURE RELATES TO A STEP ASSEMBLY HAVING A RISER WHICH IS ADJUSTABLE AND A THREAD COMPRISED OF A TREAD NOSING AND A REVERSIBLE TREAD WHICH DEFINES A HORIZONTAL SURFACE IN ONE OF ITS POSITIONS AND PROVIDES AN INTEGRAL PAN-LIKE MOLD FOR RECEIVING A STEP-FORMING MATERIAL IN ITS REVERSED POSITION.
Inventors
- 👤 Henry J Jefferys
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:43
CPC Classifications
E; E04; E04F; E04F11/00; E04F11/02; E04F11/104; E04F11/112; E04F11/022; E04F11/025; E04F11/1041
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-27 | 1975-03-29 | 1975-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-27 | 1979-03-29 | 1979-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-27 | 1983-03-29 | 1983-09-28 | $7700.00 | Window Closed / Lapsed |