US4451641A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radiation-resistant container material of poly(tetramethylene terephthalate)
Assignee: Eastman Chemical Co
•
Filing: 1983-06-13
•
Granted: 1984-05-29
•
Expires: 2003-06-13
Abstract
Abstract Radiation-resistant containers or packaging sheet material of poly(tetramethylene terephthalate) modified with either dimer acid or dimer glycol. This copolyester is blow moldable and is found to have improved resistance to gamma radiation.
Inventors
- 👤 Bobby J. Sublett
- 👤 Samuel D. Hilbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:36
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/16; C08G63/18; C08G63/199
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
71 words
A container characterized by improved resistance to gamma radiation comprising a copolyester derived from 100 mole % of a dicarboxylic acid component and 100 mole % of a glycol component, said copolyester consisting essentially of repeat units from terephthalic acid and 1,4-butanediol and about 15-50 mole % based on the total of 200 mole % of at least one compound selected from the group consisting of dimer acid and dimer glycol.
Claim 2
Dependent Claim
71 words
A container characterized by improved resistance to gamma radiation comprising a copolyester derived from 100 mole % of a dicarboxylic acid component and 100 mole % of a glycol component, said copolyester consisting essentially of repeat units from terephthalic acid and 1,4-butanediol and about 15-50 mole % based on the total of 200 mole % of at least one compound selected from the group consisting of dimer acid and dimer glycol.
Claim 3
Dependent Claim
17 words
A container according to claim 1 in which said copolyester comprises about 15-50 mole % dimer acid.
Claim 4
Dependent Claim
17 words
A container according to claim 1 in which said copolyester comprises about 15-50 mole % dimer glycol.
Claim 5
Dependent Claim
72 words
Flexible sheet material characterized by improved resistance to gamma radiation comprising a copolyester derived from 100 mole % of a dicarboxylic acid component and 100 mole % of a glycol component, said copolyester consisting essentially of repeat units from terephthalic acid and 1,4-butanediol and about 15-50 mole % based on the total of 200 mole % of at least one compound selected from the group consisting of dimer acid and dimer glycol.
Claim 6
Dependent Claim
72 words
Flexible sheet material characterized by improved resistance to gamma radiation comprising a copolyester derived from 100 mole % of a dicarboxylic acid component and 100 mole % of a glycol component, said copolyester consisting essentially of repeat units from terephthalic acid and 1,4-butanediol and about 15-50 mole % based on the total of 200 mole % of at least one compound selected from the group consisting of dimer acid and dimer glycol.
References Cited (Backward Citations)
US31270A
Cited
US3931114A
Cited
US4208467A
Cited
US4234708A
Cited
USRE31270E
Cited
US4254001A
Cited
US4340721A
Cited
US4340721B1
Cited
US4401805A
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US4403090A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-05-29 | 1987-11-28 | 1988-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-29 | 1991-11-28 | 1992-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-29 | 1995-11-28 | 1996-05-29 | $7700.00 | Window Closed / Lapsed |