Patent US3020618A successfully refreshed from Google Patents.
US3020618A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Concrete form
Assignee: Individual
•
Filing: 1958-01-20
•
Granted: 1962-02-13
•
Expires: 1978-01-20
Abstract
No abstract record available.
Inventors
- 👤 Lee E Eward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:47
CPC Classifications
B; B28; B28B; B28B21/00; B28B21/76
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR521322A
Cited
US1549406A
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US1744203A
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US1792855A
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US1871508A
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US2041911A
Cited
US2142542A
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US2621027A
Cited
GB652331A
Cited
US2726593A
Cited
US2857648A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-02-12 | 1965-08-14 | 1966-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-02-12 | 1969-08-14 | 1970-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-02-12 | 1973-08-14 | 1974-02-13 | $7700.00 | Window Closed / Lapsed |