US2731824A
Expired / Lapsed
US
⏱️ 0.0 years remaining
hadley
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
2026-10-31 19:36
CPC Classifications
E; E04; E04C; E04C3/00; E04C3/38; E04C3/46; E01; E01D; E01D2/00; E01D2/04; E04C3/02; E04C3/04; E04C3/06; E04C3/29; E04C3/293; E01D2101/00; E01D2101/20; E01D2101/24; E01D2101/26; E01D2101/268; E04C2003/0404; E04C2003/0408; E04C2003/0413; E04C2003/0426; E04C2003/043; E04C2003/0443; E04C2003/0465
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB128322A
Cited
US1740053A
Cited
US1994716A
Cited
US1979643A
Cited
US2296414A
Cited
US2241617A
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 |