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Patent US2818790A successfully refreshed from Google Patents.
US2818790A
Expired / Lapsed
US
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Curb and gutter laying machine
Assignee: E L HARDIN ASSOCIATES Inc
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Filing: 1954-11-15
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Granted: 1958-01-07
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Expires: 1974-11-15
Abstract
No abstract record available.
Inventors
- 👤 William E Canfield
- 👤 Roy W Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:01
CPC Classifications
E; E01; E01C; E01C19/00; E01C19/48; E01C19/4886; E01C19/4893; B; B28; B28B; B28B1/00; B28B1/08; B28B1/084; B28B3/00; B28B3/20; B28B3/22; B28B3/228
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) | 1961-01-06 | 1961-07-08 | 1962-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-06 | 1965-07-08 | 1966-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-06 | 1969-07-08 | 1970-01-07 | $7700.00 | Window Closed / Lapsed |