Patent US2308825A successfully refreshed from Google Patents.
US3489626A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making a prestressed,reinforced,resin-crete concrete pipe
Assignee: Chemstress Ind Inc
•
Filing: 1967-01-31
•
Granted: 1970-01-13
•
Expires: 1987-01-31
Abstract
No abstract record available.
Inventors
- 👤 David Rubenstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:17
CPC Classifications
B; B28; B28B; B28B23/00; B28B23/02; B28B23/04; B28B23/046; B28B21/00; B28B21/02; B28B21/10; B28B21/14; B28B23/06; B29; B29C; B29C67/00; B29C67/24; B29C67/242; B29C67/243; B29C70/00; B29C70/04; B29C70/28; B29C70/54; B29C70/56; B29C70/68; B29C70/86; B29C70/865; F; F16; F16L; F16L58/00; F16L58/02; F16L58/04; F16L58/10; F16L9/00; F16L9/08; B29L; B29L2023/00; B29L2023/22
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1973-01-12 | 1973-07-14 | 1974-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-12 | 1977-07-14 | 1978-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-12 | 1981-07-14 | 1982-01-13 | $7700.00 | Window Closed / Lapsed |