US4201209A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Molded hypodermic plunger with integral shaft and elastomeric head
Assignee: Device Developments Inc
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Filing: 1978-05-24
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Granted: 1980-05-06
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Expires: 1998-05-24
Abstract
Abstract Articles having portions of materials with different properties are integrally formed by injection of two different thermoplastic materials simultaneously through separate gates into the same mold wherein the materials fuse or bond together. A plunger for a syringe formed by the process has a rigid shaft and an elastomeric head.
Inventors
- 👤 Harry H. Leveen
- 👤 Robert F. Leveen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 05:04
CPC Classifications
A; A61; A61M; A61M5/00; A61M5/178; A61M5/31; A61M5/315; A61M5/31511; B; B29; B29C; B29C45/00; B29C45/16; B29C45/164; B29C45/1676; B29C45/1657; B29C2045/1659; B29L; B29L2031/00; B29L2031/753; B29L2031/7544
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
46 words
A molded plunger for a hypodermic syringe having a rigid thermoplastic shaft and a head portion made of a thermoplastic polymer having elastomeric properties compatible with the material of said shaft and integrally united therewith by co-injection molding the materials of said shaft and said head.
Claim 2
Dependent Claim
46 words
A molded plunger for a hypodermic syringe having a rigid thermoplastic shaft and a head portion made of a thermoplastic polymer having elastomeric properties compatible with the material of said shaft and integrally united therewith by co-injection molding the materials of said shaft and said head.
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US3348546A
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US3524795A
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US4082877A
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US4116914A
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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) | 1983-05-06 | 1983-11-05 | 1984-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-05-06 | 1987-11-05 | 1988-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-05-06 | 1991-11-05 | 1992-05-06 | $7700.00 | Window Closed / Lapsed |