US2731892A
Expired / Lapsed
US
⏱️ 0.0 years remaining
simmonds
Assignee: —
•
Filing: —
•
Granted: 1956-01-24
•
Expires: 1973-01-24
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:24
CPC Classifications
E; E01; E01C; E01C23/00; E01C23/06; E01C23/12; E01C23/122; E01C23/124; E02; E02F; E02F5/00; E02F5/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1822690A
Cited
US1830752A
Cited
US1748655A
Cited
US1714345A
Cited
US2079695A
Cited
US2209608A
Cited
US2334374A
Cited
US2283470A
Cited
US2335172A
Cited
US2557873A
Cited
US2606078A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-01-23 | 1959-07-25 | 1960-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-23 | 1963-07-25 | 1964-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-23 | 1967-07-25 | 1968-01-24 | $7700.00 | Window Closed / Lapsed |