US4253452A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ear plug assembly
Assignee: Cabot Safety Intermediate LLC
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Filing: 1979-05-24
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Granted: 1981-03-03
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Expires: 1999-05-24
Abstract
Abstract An ear plug assembly includes a pair of plug bodies made from open cell resilient foam material having a slow recovery rate which are interconnected by a flexible cord having its free ends inserted into preformed holes in the plug bodies before the holes close under the influence of the recovery rate.
Inventors
- 👤 William R. Powers
- 👤 William H. Lotter, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:35
CPC Classifications
A; A61; A61F; A61F11/00; A61F11/06; A61F11/08; A61F11/12; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49863; Y10T29/49865; Y10T29/4987
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
201 words
An ear plug assembly comprising a pair of generally cylindrical plug body means adapted to be inserted into the ear canal of an individual, each of said plug body means being made from an open cell resilient foam material having a slow recovery rate, a flexible cord of a length at least sufficient to extend from one ear of the user to the other ear and having a pair of free ends, and each said free ends of said cord being secured into a respective one of said plug body means by the method comprising the steps of inserting a piercing tool into said plug body means made from said open cell resilient foam material having a slow recovery rate, maintaining the piercing tool in said plug body means for a sufficient period of time to distort the body thereat and temporarily create a hole corresponding to the piercing tool, withdrawing the piercing tool to expose the hole, inserting a free end of said elongated flexible cord into the exposed hole, permitting the hole to close upon the free end of the cord, and repeating the step with the second plug body means and the opposite free end of the cord.
Claim 2
Dependent Claim
201 words
An ear plug assembly comprising a pair of generally cylindrical plug body means adapted to be inserted into the ear canal of an individual, each of said plug body means being made from an open cell resilient foam material having a slow recovery rate, a flexible cord of a length at least sufficient to extend from one ear of the user to the other ear and having a pair of free ends, and each said free ends of said cord being secured into a respective one of said plug body means by the method comprising the steps of inserting a piercing tool into said plug body means made from said open cell resilient foam material having a slow recovery rate, maintaining the piercing tool in said plug body means for a sufficient period of time to distort the body thereat and temporarily create a hole corresponding to the piercing tool, withdrawing the piercing tool to expose the hole, inserting a free end of said elongated flexible cord into the exposed hole, permitting the hole to close upon the free end of the cord, and repeating the step with the second plug body means and the opposite free end of the cord.
Claim 3
Dependent Claim
36 words
The ear plug assembly of claim 1 wherein the method includes the step of applying a bonding agent to each of the free ends of the cord before the free ends are inserted in the holes.
Claim 4
Dependent Claim
31 words
The earplug assembly of claim 2 wherein the method includes the step of maintaining the piercing tool in each plug body for a dwell time of about two to five seconds.
Claim 5
Dependent Claim
33 words
The earplug assembly of claim 3 wherein the method includes the step of maintaining the piercing tool in each said plug body means for a dwell time of about two to four seconds.
Claim 6
Dependent Claim
52 words
The earplug assembly of claim 4 wherein the plug body means are made of polyurethane, and the method further includes the step of inserting the piercing tool to a depth of about 0.5 inches in each plug body means, and each free end having a diameter of about 0.03 to 0.04 inches.
Claim 7
Dependent Claim
48 words
The earplug assembly of claim 5 wherein each plug body means is slightly frusto-conically shaped with a large end face and a smaller end face opposite therefrom, and each free end of the cord is inserted longitudinally into its plug body means through its large end face thereof.
Claim 8
Dependent Claim
32 words
The earplug of claim 1 wherein the method further includes the step of maintaining the piercing tool in each plug body means for a dwell time of about two to five seconds.
References Cited (Backward Citations)
FR74535E
Cited
US3130260A
Cited
USRE29487E
Cited
US3758916A
Cited
DE2325823A1
Cited
US3983875A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-03-02 | 1984-09-01 | 1985-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-02 | 1988-09-01 | 1989-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-02 | 1992-09-01 | 1993-03-03 | $7700.00 | Window Closed / Lapsed |