US2639826A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Articulated boom
Assignee: Individual
•
Filing: 1950-04-10
•
Granted: 1953-05-26
•
Expires: 1970-04-10
Abstract
No abstract record available.
Inventors
- 👤 David P Welden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:29
CPC Classifications
E; E02; E02F; E02F3/00; E02F3/04; E02F3/28; E02F3/36; E02F3/42; E02F3/427; E02F3/30; E02F3/32; E02F3/40; E02F3/413; E02F3/4135
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US105883A
Cited
US1603573A
Cited
US1773478A
Cited
US2109388A
Cited
US2489898A
Cited
US2418299A
Cited
US2411498A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-25 | 1956-11-24 | 1957-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-25 | 1960-11-24 | 1961-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-25 | 1964-11-24 | 1965-05-26 | $7700.00 | Window Closed / Lapsed |