US4252294A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mold for injection molding
Assignee: Asahi Kasei Corp
•
Filing: 1979-06-20
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Granted: 1981-02-24
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Expires: 1999-06-20
Abstract
Abstract PCT No. PCT/JP78/00011 Sec. 371 Date June 25, 1979 Sec. 102(e) Date June 20, 1979 PCT Filed Oct. 25, 1978, PCT Pub. No. WO 79/00235 PCT Pub. Date May 3, 1979. A Mold for injection molding suitable for the production of those molded synthetic resin articles such as lenses and prisms which are required to be homogeneous and isotropic, in which first and second gates (3, 4) are provided between runner (2) and cavity (1), said first gate (3) having a cross-sectional area smaller than that of runner (2) and connecting to second gate (4); said second gate (4) extending from first gate (3) with the width progressively increasing in a form simulating the shoulder part of a coathanger to meet cavity (1) and having constriction (5) provided halfway to the cavity.
Inventors
- 👤 Shunji Uchio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:56
CPC Classifications
B; B29; B29D; B29D11/00; B29C; B29C45/00; B29C45/17; B29C45/26; B29C45/27; B29C45/2701; B29C45/2708; B29C45/0025; B29C2045/0041; B29C45/0046; B29C2045/0048; B29D11/00009; B29D11/0048; B29L; B29L2011/00; B29L2011/0016; Y; Y10; Y10S; Y10S425/00; Y10S425/808
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
81 words
A mold for injection molding characterized in that a first gate and a second gate are provided between runner and cavity, said first gate constituting a connecting portion between the runner and the second gate and having a cross-sectional area smaller than that of the runner, said second gate extending from the first gate with width progressively increasing in a form simultating the shoulder part of a coathanger until it meets the cavity and having a constriction halfway to the cavity.
Claim 2
Dependent Claim
81 words
A mold for injection molding characterized in that a first gate and a second gate are provided between runner and cavity, said first gate constituting a connecting portion between the runner and the second gate and having a cross-sectional area smaller than that of the runner, said second gate extending from the first gate with width progressively increasing in a form simultating the shoulder part of a coathanger until it meets the cavity and having a constriction halfway to the cavity.
Claim 3
Dependent Claim
55 words
A mold for injection molding according to claim 1, wherein the cavity is composed of a mold cavity and a waste cavity connected to the rear part of said mold cavity through an opening having a depth smaller than the elevation of said rear part, said waste cavity forming a cavity deeper than said opening.
Claim 4
Dependent Claim
54 words
A mold for injection molding according to claim 1 or 2, wherein the mold has a melt stock which is situated closely to the first gate and connected to the runner, said melt stock having a cross-sectional area larger than that of the first gate and a depth larger than that of the runner.
Claim 5
Dependent Claim
21 words
A molded synthetic resin article obtained by injection molding by use of a mold for injection molding according to claim 1.
Claim 6
Dependent Claim
21 words
A molded synthetic resin article obtained by injection molding by use of a mold for injection molding according to claim 2.
Claim 7
Dependent Claim
21 words
A molded synthetic resin article obtained by injection molding by use of a mold for injection molding according to claim 3.
References Cited (Backward Citations)
US2165762A
Cited
US2360011A
Cited
US2339443A
Cited
US2799435A
Cited
US2878517A
Cited
US3013308A
Cited
US3121913A
Cited
US3247550A
Cited
US3341897A
Cited
US3333300A
Cited
US3428289A
Cited
US3463849A
Cited
US3537676A
Cited
US3776676A
Cited
US3957411A
Cited
US4091057A
Cited
US4184835A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-02-24 | 1984-08-25 | 1985-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-24 | 1988-08-25 | 1989-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-24 | 1992-08-25 | 1993-02-24 | $7700.00 | Window Closed / Lapsed |