US2648381A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of cutting duct sections
Assignee: Individual
•
Filing: 1950-03-23
•
Granted: 1953-08-11
•
Expires: 1970-03-23
Abstract
No abstract record available.
Inventors
- 👤 Engel Charles Frank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:35
CPC Classifications
B; B23; B23D; B23D19/00; B23D19/04; B21; B21D; B21D28/00; B21D28/02; B21D28/06; B23D15/00; B23D15/002; B23D31/00; B23D33/00; B23D33/02; Y; Y10; Y10T; Y10T83/00; Y10T83/04; Y10T83/0505; Y10T83/051; Y10T83/0524; Y10T83/0538; Y10T83/768; Y10T83/7684; Y10T83/7755; Y10T83/7763; Y10T83/7784
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) | 1956-08-10 | 1957-02-09 | 1957-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-10 | 1961-02-09 | 1961-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-10 | 1965-02-09 | 1965-08-11 | $7700.00 | Window Closed / Lapsed |