Patent US2448271A successfully refreshed from Google Patents.
US2448271A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vitrified clay pipe joint
Assignee: PACIFIC CLAY PRODUCTS
•
Filing: 1945-07-21
•
Granted: 1948-08-31
•
Expires: 1965-07-21
Abstract
No abstract record available.
Inventors
- 👤 Cecil V Mcclintock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:46
CPC Classifications
B; B28; B28B; B28B21/00; B28B21/52; B28B21/54
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) | 1951-08-31 | 1952-03-01 | 1952-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-08-31 | 1956-03-01 | 1956-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-08-31 | 1960-03-01 | 1960-08-31 | $7700.00 | Window Closed / Lapsed |