Patent US2857647A successfully refreshed from Google Patents.
US2857647A
Expired / Lapsed
US
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Concrete forms
Assignee: Individual
•
Filing: 1955-12-01
•
Granted: 1958-10-28
•
Expires: 1975-12-01
Abstract
No abstract record available.
Inventors
- 👤 Alta G Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 06:55
CPC Classifications
E; E04; E04G; E04G11/00; E04G11/06; E04G11/20; E04G11/28
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US751789A
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US651019A
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US713173A
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US916083A
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US1032419A
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US1368105A
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US2493264A
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US2738563A
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US2649643A
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US2723437A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-10-27 | 1962-04-28 | 1962-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-27 | 1966-04-28 | 1966-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-27 | 1970-04-28 | 1970-10-28 | $7700.00 | Window Closed / Lapsed |