US4323239A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Baseball bat
Assignee: Individual
•
Filing: 1980-04-08
•
Granted: 1982-04-06
•
Expires: 2000-04-08
Abstract
Abstract A hollow baseball bat made of a rigid material, such as a metal or a plastic and having a double structure comprising a hollow bat body and a reinforcing member disposed in the grip portion and the bending portion positioning the base end side of the bat. The reinforcing member has a trumpet-formed opening and forms a gap gradually increasing toward the opening portion between the inner wall of the bending portion of the bat. The outer circumferential surface of the reinforcing member and functions to reinforce the strength and elastic force of the bat when the bat is bent by impact of pitched ball.
Inventors
- 👤 Junichi Ishii
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:25
CPC Classifications
A; A63; A63B; A63B59/00; A63B59/50; A63B59/51; A63B59/54; A63B60/00; A63B60/06; A63B2102/00; A63B2102/18
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
193 words
In a hollow baseball bat made of a rigid material and having an impact portion, a grip portion and a flexible bending portion positioned between said impact and grip portions and joining these two portions, the improvement comprising; a circular sectional reinforcing member having a tapered cavity extending along its longitudinal axis from an end face of said member on a side of said impact portion of said baseball bat toward said grip portion, said reinforcing member having a slightly bulged surface formed at its outer circumference on an end portion on the side of said impact portion, and the wall thickness of an end portion of said reinforcing member formed having said tapered cavity gradually reducing toward said impact portion in conjunction with said tapered cavity, said reinforcing member being disposed in said grip and flexible bending portions such that said reinforcing member is in close contact with at least an inner surface of said grip portion but forms a gap gradually diverging toward said impact portion between at least a part of an inner surface of said bending portion and an outer circumference of the end portion of said reinforcing member.
Claim 2
Dependent Claim
193 words
In a hollow baseball bat made of a rigid material and having an impact portion, a grip portion and a flexible bending portion positioned between said impact and grip portions and joining these two portions, the improvement comprising; a circular sectional reinforcing member having a tapered cavity extending along its longitudinal axis from an end face of said member on a side of said impact portion of said baseball bat toward said grip portion, said reinforcing member having a slightly bulged surface formed at its outer circumference on an end portion on the side of said impact portion, and the wall thickness of an end portion of said reinforcing member formed having said tapered cavity gradually reducing toward said impact portion in conjunction with said tapered cavity, said reinforcing member being disposed in said grip and flexible bending portions such that said reinforcing member is in close contact with at least an inner surface of said grip portion but forms a gap gradually diverging toward said impact portion between at least a part of an inner surface of said bending portion and an outer circumference of the end portion of said reinforcing member.
Claim 3
Dependent Claim
36 words
A baseball bat as claimed in claim 1, wherein the reinforcing member is constructed with a solid material at a portion opposing to the grip portion and with an inwardly tapered cavity at the opening side.
Claim 4
Dependent Claim
19 words
A baseball bat as claimed in claim 1, wherein the reinforcing member is constructed with a pipe-formed hollow member.
Claim 5
Dependent Claim
12 words
A baseball bat of claim 1 wherein said rigid material is metal.
Claim 6
Dependent Claim
12 words
A baseball bat of claim 1 wherein said rigid material is plastic.
Claim 7
Dependent Claim
14 words
A baseball bat of claims 4 or 5 wherein said reinforcing member is metal.
Claim 8
Dependent Claim
15 words
A baseball bat of claims 4 or 5 wherein said reinforcing member is rigid plastic.
References Cited (Backward Citations)
US1680447A
Cited
US1792034A
Cited
US2017303A
Cited
US2967710A
Cited
US3310903A
Cited
US3479030A
Cited
US3801098A
Cited
US4214395A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-04-05 | 1985-10-05 | 1986-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-04-05 | 1989-10-05 | 1990-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-04-05 | 1993-10-05 | 1994-04-06 | $7700.00 | Window Closed / Lapsed |