Patent US2583974A successfully refreshed from Google Patents.
Patent US2672175A successfully refreshed from Google Patents.
US2672175A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pipe expander
Assignee: Individual
•
Filing: 1952-06-03
•
Granted: 1954-03-16
•
Expires: 1972-06-03
Abstract
No abstract record available.
Inventors
- 👤 Russell B Howard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:54
CPC Classifications
B; B21; B21D; B21D41/00; B21D41/02; B21D41/026
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US182724A
Cited
US428416A
Cited
US523009A
Cited
US1408546A
Cited
US1645239A
Cited
US1680650A
Cited
US1908521A
Cited
US2053815A
Cited
US2226078A
Cited
US2321308A
Cited
US2461565A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-03-15 | 1957-09-14 | 1958-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-03-15 | 1961-09-14 | 1962-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-03-15 | 1965-09-14 | 1966-03-16 | $7700.00 | Window Closed / Lapsed |