US1497058A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reenforced-concrete stairway or steps
Assignee: BARRIBALL BROTHERS Co
•
Filing: 1921-12-17
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Granted: 1924-06-10
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Expires: 1941-12-17
Abstract
No abstract record available.
Inventors
- 👤 Robert H Barriball
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 03:14
CPC Classifications
E; E04; E04F; E04F11/00; E04F11/02; E04F11/022; E04F11/025; E04F11/104; E04F11/116
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) | 1927-06-10 | 1927-12-10 | 1928-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1931-06-10 | 1931-12-10 | 1932-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1935-06-10 | 1935-12-10 | 1936-06-10 | $7700.00 | Window Closed / Lapsed |