US2828557A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Trenching machine
Assignee: Individual
•
Filing: 1955-11-25
•
Granted: 1958-04-01
•
Expires: 1975-11-25
Abstract
No abstract record available.
Inventors
- 👤 Brown William Delbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:14
CPC Classifications
E; E02; E02F; E02F3/00; E02F3/04; E02F3/08; E02F3/087; E02F3/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US99016A
Cited
US2714262A
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US1635623A
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US2341883A
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US2519075A
Cited
US2519077A
Cited
US2584287A
Cited
US2598768A
Cited
US2751698A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-03-31 | 1961-09-30 | 1962-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-03-31 | 1965-09-30 | 1966-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-03-31 | 1969-09-30 | 1970-04-01 | $7700.00 | Window Closed / Lapsed |