US2827675A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stair tread construction
Assignee: Individual
•
Filing: 1954-05-21
•
Granted: 1958-03-25
•
Expires: 1974-05-21
Abstract
No abstract record available.
Inventors
- 👤 Herbert F Nelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:35
CPC Classifications
E; E04; E04F; E04F11/00; E04F11/02; E04F11/104; E04F11/1043; E04F11/1045; E04F11/16; E04F11/163
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) | 1961-03-24 | 1961-09-23 | 1962-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-03-24 | 1965-09-23 | 1966-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-03-24 | 1969-09-23 | 1970-03-25 | $7700.00 | Window Closed / Lapsed |