Patent US3568657A successfully refreshed from Google Patents.
US3568657A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rock-breaking tool
Assignee: Individual
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Filing: 1968-03-08
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Granted: 1971-03-09
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Expires: 1988-03-08
Abstract
Abstract An elongated rock-breaking bar is provided at one end with a chisel point and at the opposite end with a chisel edge. Intermediate these ends are a pair of longitudinally spaced collars between which a hammer member is mounted slidably on the bar. In one embodiment the bar is made in two detachable longitudinal sections and the hammer member is made in one piece. In another embodiment the bar is made in one piece and the hammer member is made in two detachable lateral sections.
Inventors
- 👤 Leonard L Gue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:47
CPC Classifications
B; B25; B25D; B25D1/00; B25D1/16
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
10 words
securing means Interengaging said halves for releasably securing them together.
Claim 2
Dependent Claim
26 words
The tool of claim 1 including interengaging tongue and groove means on the lateral halves of the hammer member for securing them against relative longitudinal displacement.
Claim 3
Dependent Claim
74 words
interengaging means on the ends of the sections opposite said contoured tips for releasably securing said sections together; b. a pair of longitudinally spaced, enlarged abutment members one on each of the longitudinal bar sections integral with and intermediate the ends of the latter; and c. a hollow hammer member of one-piece construction having a longitudinal bore therethrough mounted slidably on the bar between said abutment members for selective striking engagement with the latter.
Claim 4
Dependent Claim
19 words
A rock-breaking tool comprising: a. an elongated bar having rock-breaking contoured tips at its opposite ends, the bar comprising:
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-08 | 1974-09-07 | 1975-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-08 | 1978-09-07 | 1979-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-08 | 1982-09-07 | 1983-03-09 | $7700.00 | Window Closed / Lapsed |