US3520749A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making filament wound reinforced concrete pipe
Assignee: Chem Stress Industries Inc
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Filing: 1967-05-15
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Granted: 1970-07-14
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Expires: 1987-05-15
Abstract
No abstract record available.
Inventors
- 👤 David Rubenstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:57
CPC Classifications
B; B28; B28B; B28B23/00; B28B23/02; B28B23/04; B28B23/046; B29; B29C; B29C48/00; B29C48/03; B29C48/07; B29C48/08; B29C48/09; B29C48/15; B29C48/151; B29C48/152; B29C48/153; B29C48/25; B29C48/36; B29C48/50; B29C53/00; B29C53/56
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-07-13 | 1974-01-12 | 1974-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-13 | 1978-01-12 | 1978-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-13 | 1982-01-12 | 1982-07-14 | $7700.00 | Window Closed / Lapsed |