US2520199A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ditch pipe forming machine
Assignee: Individual
•
Filing: 1947-10-06
•
Granted: 1950-08-29
•
Expires: 1967-10-06
Abstract
No abstract record available.
Inventors
- 👤 Butcher Albert Floyd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:09
CPC Classifications
E; E02; E02F; E02F3/00; E02F3/04; E02F3/18; E02F3/186; E02D; E02D15/00; E02D15/02; E02D15/04; E02F3/20; E02F5/00; E02F5/02; E02F5/08; E21; E21D; E21D11/00; E21D11/04; E21D11/10; E21D11/105
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US220757A
Cited
US1309878A
Cited
US1146477A
Cited
US1075877A
Cited
US1887244A
Cited
US2123243A
Cited
US2406025A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-08-28 | 1954-02-27 | 1954-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-08-28 | 1958-02-27 | 1958-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-08-28 | 1962-02-27 | 1962-08-29 | $7700.00 | Window Closed / Lapsed |