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Patent US3674620A successfully refreshed from Google Patents.
US3674620A
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US
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Reinforced plastic panel and method of making the same
Assignee: Butler Manufacturing Co
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Filing: 1970-05-25
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Granted: 1972-07-04
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Expires: 1990-05-25
Abstract
Abstract A CORRUGATED PANEL HAVING A NEUTRAL PLANE, CONTINUOUS ELONGATED LONGITUDINALLY DISPOSED SPACED APART REINFORCING MEANS POSITIONED AT LEAST AT THE APICES OF THE CORRUGATIONS IN SAID PANEL AND SPACED FROM THE NETURAL PLANE OF THE PANEL TO IMPART MAXIMUM STRENGTH THERETO, AND THE METHOD OF MAKING SUCH PANEL.
Inventors
- 👤 Robert P Mccarthy
- 👤 Charles W Matlock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:28
CPC Classifications
B; B32; B32B; B32B23/00; B32B23/04; B29; B29C; B29C53/00; B29C53/22; B29C53/24; B29C53/26; B29C70/00; B29C70/04; B29C70/28; B29C70/40; B29C70/50; B29C70/504; B32B23/06; B32B23/08; B32B3/00; B32B3/26; B32B3/28; B29C70/68; B29C70/685; B29C70/687; B32B2262/00; B32B2262/10; B32B2262/101; B32B2305/00; B32B2305/08; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24132; Y10T428/24628; Y10T428/24669; Y10T428/24694
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) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |