US2428764A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for cold bending of large diameter thin walled pipe
Assignee: CRUTCHER ROLFS CUMMINGS COMPAN
•
Filing: 1944-01-22
•
Granted: 1947-10-07
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Expires: 1964-01-22
Abstract
No abstract record available.
Inventors
- 👤 James D Cummings
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:04
CPC Classifications
B; B21; B21D; B21D7/00; B21D7/02; B21D7/022; B21D7/0225
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-10-06 | 1951-04-07 | 1951-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-10-06 | 1955-04-07 | 1955-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-10-06 | 1959-04-07 | 1959-10-07 | $7700.00 | Window Closed / Lapsed |