Patent US2164397A successfully refreshed from Google Patents.
Patent US3370387A successfully refreshed from Google Patents.
US3370387A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Prefabricated stair
Assignee: WILLIAM FRED SIVLEY
•
Filing: 1966-04-01
•
Granted: 1968-02-27
•
Expires: 1986-04-01
Abstract
No abstract record available.
Inventors
- 👤 Sivley William Fred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:47
CPC Classifications
E; E04; E04F; E04F11/00; E04F11/02; E04F11/022; E04F11/025
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US919789A
Cited
US1063216A
Cited
US1051753A
Cited
US1134992A
Cited
US1684764A
Cited
US1792792A
Cited
US3290839A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-02-26 | 1971-08-28 | 1972-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-02-26 | 1975-08-28 | 1976-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-02-26 | 1979-08-28 | 1980-02-27 | $7700.00 | Window Closed / Lapsed |