US3540139A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Foundation trenching attachment for a trenching machine
Assignee: GETHMANN CONSTRUCTION CO Inc
•
Filing: 1968-07-25
•
Granted: 1970-11-17
•
Expires: 1988-07-25
Abstract
No abstract record available.
Inventors
- 👤 Kenneth W Gethmann
- 👤 Russell J Dye
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 05:28
CPC Classifications
E; E02; E02F; E02F3/00; E02F3/04; E02F3/08; E02F3/10; E02F3/085
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US3235982A
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US3209472A
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US3253357A
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US3286377A
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US3461579A
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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) | 1973-11-16 | 1974-05-18 | 1974-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-16 | 1978-05-18 | 1978-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-16 | 1982-05-18 | 1982-11-17 | $7700.00 | Window Closed / Lapsed |