US4171699A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mercaptan modified methyl methacrylate-alpha methyl styrene copolymer syringe
Assignee: Princeton Polymer Laboratories Inc
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Filing: 1977-05-09
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Granted: 1979-10-23
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Expires: 1997-05-09
Abstract
Abstract A steam sterilizable copolymer is prepared from 60 to 50% by weight of alpha methyl styrene and 40 to 50% by weight of methyl methacrylate. The copolymer is useful to make the barrel of syringe which is clear, water-white and shows no distortion upon steam sterilization for at least 20 minutes at 250° F.
Inventors
- 👤 William D. Jones
- 👤 Donald E. Hudgin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:52
CPC Classifications
A; A61; A61M; A61M5/00; A61M5/178; A61M5/31; A61M5/3129
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
50 words
A clear, water-white molded syringe barrel capable of being sterilized at 250° F. for 20 minutes without shrinkage while retaining its clear, water-white appearance, said syringe being made of a copolymer of 50 to 60% by weight of alpha methyl styrene and 50 to 40% by weight of methyl methacrylate.
Claim 2
Dependent Claim
50 words
A clear, water-white molded syringe barrel capable of being sterilized at 250° F. for 20 minutes without shrinkage while retaining its clear, water-white appearance, said syringe being made of a copolymer of 50 to 60% by weight of alpha methyl styrene and 50 to 40% by weight of methyl methacrylate.
Claim 3
Dependent Claim
24 words
A syringe barrel according to claim 1 made from 54 parts by weight alpha methyl styrene and 46 parts by weight of methyl methacrylate.
Claim 4
Dependent Claim
13 words
A syringe barrel according to claim 2 which is an injection molded barrel.
Claim 5
Dependent Claim
46 words
A syringe barrel according to claim 3 which is sterile as a result of having been subjected to sterilization at a temperature of at least 250° F. for at least 20 minutes and is characterized by being water-white, clear and free of shrinkage after such sterilization.
Claim 6
Dependent Claim
45 words
A syringe barrel according to claim 2 which is sterile as a result of having been subjected to sterilization at a temperature of at least 250° F. for at least 20 minutes and is characterized by being clear, water-white and free of shrinkage after sterilization.
Claim 7
Dependent Claim
13 words
A syringe barrel according to claim 1 which is an injection molded barrel.
Claim 8
Dependent Claim
45 words
A syringe barrel according to claim 6 which is sterile as a result of having been subjected to sterilization at a temperature of at least 250° F. for at least 20 minutes and is characterized by being clear, water-white and free of shrinkage after sterilization.
Claim 9
Dependent Claim
45 words
A syringe barrel according to claim 1 which is sterile as a result of having been subjected to sterilization at a temperature of at least 250° F. for at least 20 minutes and is characterized by being clear, water-white and free of shrinkage after sterilization.
Claim 10
Dependent Claim
35 words
A syringe comprising a combination of the barrel of claim 1 and a plunger of a plastic and is characterized by being dimensionally stable when subjected to steam sterilization at 250° F. for 20 minutes.
Claim 11
Dependent Claim
13 words
A syringe according to claim 9 wherein the plunger is made of polypropylene.
Claim 12
Dependent Claim
32 words
A syringe according to claim 9 wherein the plunger is made of a plastic which is clear, water-white and dimensionally stable when subjected to steam sterilization at 250° F. for 20 minutes.
Claim 13
Dependent Claim
18 words
A syringe according to claim 11 wherein the plunger is made of the same copolymer as the barrel.
Claim 14
Dependent Claim
12 words
A syringe according to claim 9 wherein the barrel is injection molded.
Claim 15
Dependent Claim
15 words
A syringe according to claim 13 wherein both the barrel and plunger are injection molded.
Claim 16
Dependent Claim
28 words
A syringe according to claim 13 wherein the barrel is made from 54 parts by weight of alpha methyl styrene and 46 parts by weight of methyl methacrylate.
Claim 17
Dependent Claim
15 words
A syringe comprising in combination a needle and the barrel and plunger of claim 15.
Claim 18
Dependent Claim
25 words
A syringe according to claim 16 which is sterile as a result of having been subjected to steam sterilization at 250° F. for 20 minutes.
Claim 19
Dependent Claim
15 words
A syringe comprising in combination a needle and the barrel and plunger of claim 13.
Claim 20
Dependent Claim
28 words
A syringe according to claim 18 which is sterile as a result of having been sterilized by being subjected to steam sterilization at 250° F. for 20 minutes.
References Cited (Backward Citations)
CA806435A
Cited
GB712861A
Cited
US3072622A
Cited
US3135723A
Cited
US3183217A
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US3291128A
Cited
GB1123724A
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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) | 1982-10-22 | 1983-04-23 | 1983-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-10-22 | 1987-04-23 | 1987-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-10-22 | 1991-04-23 | 1991-10-23 | $7700.00 | Window Closed / Lapsed |