US4397706A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for making molded articles
Assignee: West Pharmaceutical Services Inc
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Filing: 1982-03-22
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Granted: 1983-08-09
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Expires: 2002-03-22
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 curing 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. Kalocai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:54
CPC Classifications
B; B29; B29C; B29C43/00; B29C43/02; B29C43/18; B29C43/183; B29C31/00; B29C31/04; B29C31/06; B29C31/065; B29C31/066; B29C43/04; B29C43/14; B29C43/146; B29C43/32; B29C43/34; B29C70/00; B29C70/68; B29C70/78; B29C70/80; B65; B65D; B65D51/00; B65D51/002; B29C2043/046; B29C2043/3405; B29C2043/3422; B29C43/36; B29C43/361; B29C2043/3615; B29C2043/3618; B29C2043/3621; B29C2043/3623; B29K; B29K2021/00; B29K2105/00; B29K2105/25; B29K2105/253; B29K2105/256; B29L; B29L2031/00; B29L2031/56; B29L2031/565; B29L2031/748; B29L2031/7494; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1052; Y10T156/1062; Y10T156/107; Y10T156/1072; Y10T156/12; Y10T156/1317; Y10T156/137; Y10T428/00; Y10T428/26; Y10T428/31504; Y10T428/31536; Y10T428/31678; Y10T428/31707
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
106 words
A method for making articles comprised of a body portion of an elastomeric material and a liner of an inert material covering at least a portion of the peripheral surface of the body portion consisting of the steps of bonding a layer of elastomeric to one face of a layer of the inert material, forming at least one clad element of a predetermined configuration, positioning the clad element 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 curing the elastomeric materials.
Claim 2
Independent Claim
106 words
A method for making articles comprised of a body portion of an elastomeric material and a liner of an inert material covering at least a portion of the peripheral surface of the body portion consisting of the steps of bonding a layer of elastomeric to one face of a layer of the inert material, forming at least one clad element of a predetermined configuration, positioning the clad element 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 curing the elastomeric materials.
Claim 3
Dependent Claim
33 words
A method as claimed in claim 1, wherein the bonding of the layer of elastomeric to one face of a layer of the inert material is without the interposition of an adhesive therebetween.
Claim 4
Dependent Claim
46 words
A method as claimed in claim 1 wherein the liner is a flexible, non-metallic member and wherein the positioning of the clad element in the mold cavity includes flexing the clad element so that it does not lie in a single plane in the mold cavity.
Claim 5
Dependent Claim
34 words
A method as claimed in claim 1 wherein the layer of elastomeric material is cured after bonding to said layer of inert material and prior to positioning the bonded layers in the mold cavity.
Claim 6
Dependent Claim
37 words
A method as claimed in claim 1 wherein the layer of elastomeric material is uncured rubber and the layer of inert material is Teflon which is chemically etched on the face thereof bonded to said rubber layer.
Claim 7
Dependent Claim
28 words
A method as claimed in claim 1 wherein the layer of elastomeric material and the additional charge of elastomeric material added to the mold cavity are natural rubber.
Claim 8
Dependent Claim
27 words
A method as claimed in claim 1 wherein the layer of elastomeric material and the charge of elastomeric material added to the mold cavity are synthetic rubber.
Claim 9
Dependent Claim
60 words
A method as claimed in claim 1 wherein said clad element is of circular shape and of a diameter greater than the diameter of the mold cavity adjacent the bottom thereof so that when the clad element is positioned therein centrally thereof, the outer circumferential edge is turned upwardly to form a circumferentially extending return flange in the finished article.
Claim 10
Dependent Claim
32 words
A method as claimed in claim 1 wherein a plurality of clad elements are formed during the forming step and transferred and positioned as a group in plural cavities of a mold.
Claim 11
Dependent Claim
42 words
A method as claimed in claim 9 including the steps of loading the clad elements in a loading rack and positioning the filled loading rack over the mold cavities and transferring the clad elements from the loading rack to the mold cavities.
Claim 12
Dependent Claim
50 words
A method as claimed in claim 10 wherein the clad elements are of generally disc shape and the loading race has a plurality of openings to receive said discs, each opening having a pilot portion of circular cross section and a reduced throat section defining a seat for the disc.
Claim 13
Dependent Claim
21 words
A method as claimed in claim 10 wherein the clad elements are supported in openings of the loading rack by friction.
Claim 14
Dependent Claim
35 words
A method as claimed in claim 11 where the diameter of the pilot portion is preferably equal to or greater than the diameter of the disc and the throat portion is of a narrower diameter.
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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 |