US4614276A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laminated rubber stopper
Assignee: DAIKYO GOMU SEIKO KK
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Filing: 1985-05-21
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Granted: 1986-09-30
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Expires: 2005-05-21
Abstract
Abstract A laminated rubber stopper comprising a head portion and a leg portion which is to be inserted in an opening of a vessel, wherein at least a leg portion is laminated with a film of a copolymer of tetrafluoroethylene, ethylene and at least one fluorine-containing vinyl monomer copolymerizable with tetrafluoroethylene and ethylene, a molar ratio of tetrafluoroethylene and ethylene being from 62:38 to 90:10 and the amount of the fluorine-containing vinyl monomer being from 0.1 to 10% by mole based on the total number of mole of tetrafluoroethylene and ethylene, which has improved fitting with an opening of a vessel and sealing properties and can be produced with low failure rate.
Inventors
- 👤 Kiyohiko Ihara
- 👤 Tsuneo Nakagawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:59
CPC Classifications
B; B65; B65D; B65D51/00; B65D51/002; B65D39/00; B65D39/0005; B65D39/0029; C; C08; C08F; C08F214/00; C08F214/18; C08F214/26; C08F214/265; B65D2539/00; B65D2539/001; B65D2539/008
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
90 words
A laminated rubber stopper comprising a head portion and a leg portion which is to be inserted in an opening of an vessel, wherein at least a leg portion is laminated with a film of a copolymer of tetrafluoroethylene, ethylene and at least one fluorine-containing vinyl monomer copolymerizable with tetrafluoroethylene and ethylene, a molar ratio of tetrafluoroethylene and ethylene being from 62:38 to 90:10 and the amount of the fluorine-containing vinyl monomer being from 0.1 to 10% by mole based on the total number of mole of tetrafluoroethylene and ethylene.
Claim 2
Dependent Claim
90 words
A laminated rubber stopper comprising a head portion and a leg portion which is to be inserted in an opening of an vessel, wherein at least a leg portion is laminated with a film of a copolymer of tetrafluoroethylene, ethylene and at least one fluorine-containing vinyl monomer copolymerizable with tetrafluoroethylene and ethylene, a molar ratio of tetrafluoroethylene and ethylene being from 62:38 to 90:10 and the amount of the fluorine-containing vinyl monomer being from 0.1 to 10% by mole based on the total number of mole of tetrafluoroethylene and ethylene.
Claim 3
Dependent Claim
22 words
A laminated rubber stopper according to claim 1, wherein the thickness of the laminated copolymer film is from 0.002 to 0.5 mm.
Claim 4
Dependent Claim
23 words
A laminated rubber stopper according to claim 1, wherein the copolymer contains tetrafluoroethylene and ethylene in a molar ratio of 63:37 to 80:20.
Claim 5
Dependent Claim
33 words
A laminated rubber stopper according to claim 1, wherein the copolymer contains the fluorine-containing monomer in an amount of 0.5 to 5% by mole based on the total amount of tetrafluoroethylene and ethylene.
References Cited (Backward Citations)
US3760969A
Cited
US4554125A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-09-29 | 1990-03-31 | 1990-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-09-29 | 1994-03-31 | 1994-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-09-29 | 1998-03-31 | 1998-09-30 | $7700.00 | Window Closed / Lapsed |