US2474937A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-cleaning grid tamper for concrete
Assignee: Individual
•
Filing: 1946-07-31
•
Granted: 1949-07-05
•
Expires: 1966-07-31
Abstract
No abstract record available.
Inventors
- 👤 John T Feeley
- 👤 Wells P Goodenough
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:30
CPC Classifications
B; B28; B28B; B28B1/00; B28B1/04; E; E01; E01C; E01C19/00; E01C19/22; E01C19/30; E01C19/32; E04; E04G; E04G21/00; E04G21/02; E04G21/06; E04G21/063; E04G21/066
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) | 1952-07-04 | 1953-01-03 | 1953-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-07-04 | 1957-01-03 | 1957-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-07-04 | 1961-01-03 | 1961-07-05 | $7700.00 | Window Closed / Lapsed |