Patent US4564313B2 successfully refreshed from Google Patents.
US4564313B2
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rectilinear culvert structure
Assignee: HY-SPAN SYSTEM Inc
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Filing: 1983-09-29
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Granted: 1995-05-09
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Expires: 2003-09-29
Abstract
No abstract record available.
Inventors
- 👤 Robert L Niswander
- 👤 Tomy W Cornwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 17:54
CPC Classifications
E; E01; E01F; E01F5/00; E01F5/005; E01D; E01D1/00; E01D2101/00; E01D2101/20; E01D2101/24; E01D2101/26
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-05-08 | 1998-11-07 | 1999-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-05-08 | 2002-11-07 | 2003-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-05-08 | 2006-11-07 | 2007-05-09 | $7700.00 | Window Closed / Lapsed |