US3381775A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stair tread structure
Assignee: LIVERS BRONZE CO
•
Filing: 1967-01-03
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Granted: 1968-05-07
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Expires: 1987-01-03
Abstract
No abstract record available.
Inventors
- 👤 Harold F Livers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:16
CPC Classifications
E; E04; E04F; E04F11/00; E04F11/02; E04F11/022; E04F11/025; E04F11/104; E04F11/112; E04F11/16; E04F11/163; E04F11/17; E04F11/18; E04F11/181; E04F11/1812
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-05-07 | 1971-11-06 | 1972-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-05-07 | 1975-11-06 | 1976-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-05-07 | 1979-11-06 | 1980-05-07 | $7700.00 | Window Closed / Lapsed |