Patent US2702931A successfully refreshed from Google Patents.
US2702931A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mold for concrete stairway runners
Assignee: Individual
•
Filing: 1951-11-23
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Granted: 1955-03-01
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Expires: 1971-11-23
Abstract
No abstract record available.
Inventors
- 👤 Emil J Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:39
CPC Classifications
B; B28; B28B; B28B7/00; B28B7/22; B28B7/225
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) | 1958-02-28 | 1958-08-30 | 1959-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-02-28 | 1962-08-30 | 1963-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-02-28 | 1966-08-30 | 1967-03-01 | $7700.00 | Window Closed / Lapsed |