Patent US3429241A successfully refreshed from Google Patents.
US3429241A
Expired / Lapsed
US
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Concrete form
Assignee: Ankortite Co Inc
•
Filing: 1966-11-28
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Granted: 1969-02-25
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Expires: 1986-11-28
Abstract
No abstract record available.
Inventors
- 👤 Duane C Burton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:45
CPC Classifications
E; E01; E01C; E01C11/00; E01C11/02; E01C11/04; E01C11/08; E01C11/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1349340A
Cited
US1770359A
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US2332109A
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US2848929A
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US3057269A
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US3143783A
Cited
US3288042A
Cited
US3357324A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-02-25 | 1972-08-26 | 1973-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-25 | 1976-08-26 | 1977-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-25 | 1980-08-26 | 1981-02-25 | $7700.00 | Window Closed / Lapsed |