US3448535A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Back hoe apparatus having movable teeth
Assignee: ROCKMASTER TOOLS Inc
•
Filing: 1968-04-22
•
Granted: 1969-06-10
•
Expires: 1988-04-22
Abstract
No abstract record available.
Inventors
- 👤 Freddie J Haynes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:54
CPC Classifications
E; E02; E02F; E02F3/00; E02F3/04; E02F3/28; E02F3/36; E02F3/40; E02F3/402; E02F3/405
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2704613A
Cited
US1067375A
Cited
US1878037A
Cited
US2228445A
Cited
US2245544A
Cited
US2393432A
Cited
US2443492A
Cited
US2657480A
Cited
US2619748A
Cited
US2777680A
Cited
US2850815A
Cited
US3084817A
Cited
US3065557A
Cited
US3145488A
Cited
US3219388A
Cited
US3269039A
Cited
US3293778A
Cited
US3328904A
Cited
US3272559A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-09 | 1972-12-09 | 1973-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-09 | 1976-12-09 | 1977-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-09 | 1980-12-09 | 1981-06-10 | $7700.00 | Window Closed / Lapsed |