US2358750A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cover for manholes or the like
Assignee: CAST STONE INST
•
Filing: 1942-08-26
•
Granted: 1944-09-19
•
Expires: 1962-08-26
Abstract
No abstract record available.
Inventors
- 👤 Charles G Walker
- 👤 Frauenfelder Herman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:11
CPC Classifications
E; E02; E02D; E02D29/00; E02D29/12; E02D29/14
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) | 1947-09-19 | 1948-03-20 | 1948-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1951-09-19 | 1952-03-20 | 1952-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1955-09-19 | 1956-03-20 | 1956-09-19 | $7700.00 | Window Closed / Lapsed |