Patent US4397903A successfully refreshed from Google Patents.
US4397903A
Expired / Lapsed
US
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Molded articles
Assignee: West Pharmaceutical Services Inc
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Filing: 1981-05-01
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Granted: 1983-08-09
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Expires: 2001-05-01
Abstract
Abstract Disclosed is a method for making articles comprised of a body portion of an elastomeric material having a liner of an inert material covering at least a portion of the peripheral surface of said body portion including the steps of bonding a layer of elastomeric material to one face of a layer of the inert material, positioning the bonded layers in a mold cavity with the layer of inert material contacting at least a portion of the surface of a mold cavity, adding additional amounts of uncured elastomeric material to the mold cavity and vulcanizing the elastomeric materials. Also disclosed herein is a system and apparatus for making molded articles as well as the molded articles produced thereby.
Inventors
- 👤 Roland M. Allen
- 👤 Andrew J. Kolacai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:29
CPC Classifications
B; B32; B32B; B32B38/00; B32B38/04; B29; B29C; B29C31/00; B29C31/04; B29C31/06; B29C31/065; B29C31/066; B29C43/00; B29C43/02; B29C43/18; B29C43/183; B29C70/00; B29C70/68; B29C70/78; B29C70/80; B29C2793/00; B29C2793/0081; B29C31/08; B29K; B29K2021/00; B29K2027/00; B29K2027/12; B29K2027/18; B29K2105/00; B29K2105/25; B29K2105/253; B29K2105/255; B29L; B29L2031/00; B29L2031/753; B29L2031/7544; Y; Y10; Y10S; Y10S215/00; Y10S215/02; Y10S215/03; Y10S215/04; Y10T; Y10T428/00; Y10T428/24; Y10T428/24479; Y10T428/2457; Y10T428/24942; Y10T428/2495; Y10T428/24967; Y10T428/31504; Y10T428/3154; Y10T428/31826
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
126 words
A plunger for a syringe assembly comprising a generally cylindrical body portion made of an elastomeric material, at least one radially outwardly directed rib adjacent one axial end thereof, said rib being of arcuate cross section, a clad element at said one axial end consisting of a layer of elastomeric material about 0.030 to 0.110 inches thick and a layer of polytetrafluoroethylene between 0.002 and 0.003 inches thick bonded thereto, said layer of polytetrafluoroethylene overlying said one axial end and including a circumferentially extending return skirt overlying a portion of said rib, the terminal edge of said skirt terminating approximately at a circumferential line tangent to said rib at its maximum cross section and in a plane transverse to the central axis of said body portion.
Claim 2
Dependent Claim
126 words
A plunger for a syringe assembly comprising a generally cylindrical body portion made of an elastomeric material, at least one radially outwardly directed rib adjacent one axial end thereof, said rib being of arcuate cross section, a clad element at said one axial end consisting of a layer of elastomeric material about 0.030 to 0.110 inches thick and a layer of polytetrafluoroethylene between 0.002 and 0.003 inches thick bonded thereto, said layer of polytetrafluoroethylene overlying said one axial end and including a circumferentially extending return skirt overlying a portion of said rib, the terminal edge of said skirt terminating approximately at a circumferential line tangent to said rib at its maximum cross section and in a plane transverse to the central axis of said body portion.
References Cited (Backward Citations)
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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) | 1986-08-08 | 1987-02-07 | 1987-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-08 | 1991-02-07 | 1991-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-08 | 1995-02-07 | 1995-08-09 | $7700.00 | Window Closed / Lapsed |