US2849809A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ditcher with divergent wings
Assignee: Individual
•
Filing: 1953-09-28
•
Granted: 1958-09-02
•
Expires: 1973-09-28
Abstract
No abstract record available.
Inventors
- 👤 Robert C Chattin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:41
CPC Classifications
E; E02; E02F; E02F5/00; E02F5/02; E02F5/027; E02F3/00; E02F3/04; E02F3/76; E02F3/7663
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
USRE20990E
Cited
US869115A
Cited
US1213434A
Cited
US1777689A
Cited
US2067168A
Cited
US2193532A
Cited
US2202050A
Cited
US2662311A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-09-01 | 1962-03-03 | 1962-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-01 | 1966-03-03 | 1966-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-01 | 1970-03-03 | 1970-09-02 | $7700.00 | Window Closed / Lapsed |