Patent US1137944A successfully refreshed from Google Patents.
Patent US3367444A successfully refreshed from Google Patents.
US3367444A
Expired / Lapsed
US
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Adjustable stairway
Assignee: Olin Corp
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Filing: 1966-05-31
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Granted: 1968-02-06
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Expires: 1986-05-31
Abstract
No abstract record available.
Inventors
- 👤 John W Meddick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:57
CPC Classifications
E; E04; E04F; E04F11/00; E04F11/02; E04F11/022; E04F11/025; E04F11/0255
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US501694A
Cited
US1189514A
Cited
US2498375A
Cited
US2522336A
Cited
US2867855A
Cited
US3299590A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-02-05 | 1971-08-07 | 1972-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-02-05 | 1975-08-07 | 1976-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-02-05 | 1979-08-07 | 1980-02-06 | $7700.00 | Window Closed / Lapsed |