Patent US2721368A successfully refreshed from Google Patents.
US2721368A
Expired / Lapsed
US
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Concrete picket fence form
Assignee: Individual
•
Filing: 1952-03-20
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Granted: 1955-10-25
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Expires: 1972-03-20
Abstract
No abstract record available.
Inventors
- 👤 Ellis E Landrum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:09
CPC Classifications
B; B28; B28B; B28B7/00; B28B7/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US879076A
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US890351A
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US904098A
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US968285A
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FR568939A
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US2397728A
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US2445894A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-10-24 | 1959-04-25 | 1959-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-10-24 | 1963-04-25 | 1963-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-10-24 | 1967-04-25 | 1967-10-25 | $7700.00 | Window Closed / Lapsed |