US3959200A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copolyester composition
Assignee: EIDP Inc
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Filing: 1973-10-25
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Granted: 1976-05-25
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Expires: 1993-10-25
Abstract
Abstract Disclosed herein is a linear, essentially non-crystalline copolyester composition comprising in polymerized form polymethylene glycol units of 2 to 6 carbon atoms, aliphatic dicarboxylic acid units of 5 to 10 carbon atoms, and isophthalic acid units, the isophthalic acid units comprising from about 10 to 50 mol percent of the total acid units, and the copolyester composition having an intrinsic viscosity in the range of about 0.3 to 0.8. The composition is useful in fabricating custom-molded earplugs by inserting into and sealing the auditory canal of the ear.
Inventors
- 👤 Paul Thigpen Scott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:54
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/16; C08G63/18; C08G63/181; C08L; C08L67/00; C08L67/02; A; A61; A61F; A61F11/00; A61F11/06; A61F11/08; Y; Y10; Y10S; Y10S525/00; Y10S525/935
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
92 words
A composition suitable for use as a human earplug, the composition comprising A. a linear copolyester consisting essentially of, in polymerized form, 1. at least one polymethylene glycol of the formula HO--(CH 2 ) n --OH, wherein n is an integer of 2 to 6, 2. at least one aliphatic dicarboxylic acid of the formula HOOC--(CH 2 ) x --COOH, wherein x is an integer of 3 to 8, and 3. about 10 to 50 mol percent of the total amount of acid in the copolyester of isophthalic acid; the copolyester having
Claim 2
Dependent Claim
92 words
A composition suitable for use as a human earplug, the composition comprising A. a linear copolyester consisting essentially of, in polymerized form, 1. at least one polymethylene glycol of the formula HO--(CH 2 ) n --OH, wherein n is an integer of 2 to 6, 2. at least one aliphatic dicarboxylic acid of the formula HOOC--(CH 2 ) x --COOH, wherein x is an integer of 3 to 8, and 3. about 10 to 50 mol percent of the total amount of acid in the copolyester of isophthalic acid; the copolyester having
Claim 3
Dependent Claim
47 words
an intrinsic viscosity of about 0.3 to 0.8, 5. a degree of crystallinity less than about 10%, as determined by X-ray diffraction, and 6. a polymer melt temperature of 20°C to 45°C; B. up to 1% of a silicone oil; and C. up to 1% of fibers.
Claim 4
Dependent Claim
47 words
an intrinsic viscosity of about 0.3 to 0.8, 5. a degree of crystallinity less than about 10%, as determined by X-ray diffraction, and 6. a polymer melt temperature of 20°C to 45°C; B. up to 1% of a silicone oil; and C. up to 1% of fibers.
Claim 5
Dependent Claim
29 words
The composition of claim 1 wherein the isophthalic acid in (A) (3) comprises from about 20 to 30 mol percent of the total amount of acid in the copolyester.
Claim 6
Dependent Claim
18 words
The composition of claim 1 in which the copolyester has an intrinsic viscosity of about 0.45 to 0.55.
Claim 7
Dependent Claim
14 words
The composition of claim 1 wherein the glycol in (A) (1) is ethylene glycol.
Claim 8
Dependent Claim
14 words
The composition of claim 1 wherein the acid in (A) (2) is adipic acid.
Claim 9
Dependent Claim
45 words
The composition of claim 1 wherein the glycol in (A) (1) is ethylene glycol, the acid in (A) (2) is adipic acid and the isophthalic acid in (A) (3) comprises about 20 to 30 mol percent of the total amount of acid in the copolyester.
Claim 10
Dependent Claim
22 words
The composition of claim 1 wherein the fibers in (C) are fibers of nylon or polyester 1/8 inch to 1/4 inch long.
Claim 11
Dependent Claim
21 words
The composition of claim 6 wherein the fibers in (C) are fibers of nylon or polyester 1/8 to 1/4 inch long.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-05-25 | 1979-11-24 | 1980-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-25 | 1983-11-24 | 1984-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-25 | 1987-11-24 | 1988-05-25 | $7700.00 | Window Closed / Lapsed |