US4753423A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synthetic resin-coated spring and method for making same
Assignee: Mitsubishi Steel Mfg Co Ltd
•
Filing: 1986-05-30
•
Granted: 1988-06-28
•
Expires: 2006-05-30
Abstract
Abstract A synthetic resin-coated spring comprising a spring body and a synthetic resin coating layer formed on the spring body. The synthetic resin coating layer contains an olefin polymer modified with an unsaturated carboxylic acid or a derivative thereof. A method for making the coated spring is also described.
Inventors
- 👤 Kenji Ukai
- 👤 Katsumi Yano
- 👤 Nobumasa Umezawa
- 👤 Satoru Yamaguchi
- 👤 Takao Itoga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:23
CPC Classifications
F; F16; F16F; F16F1/00; F16F1/02; F16F1/024; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/294
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
91 words
A synthetic resin-coated metallic coil spring which comprises a spring body and a synthetic resin coating containing an olefin polymer modified with an unsaturated carboxylic acid compound which is a member selected from the group consisting of unsaturated carboxylic acids and derivatives thereof, said synthetic resin coating being formed on the surface of said spring body and said olefin polymer being a member selected from the group consisting of ethylene-alpha-olefin copolymers having a density of from 0.86 to 0.94 g/cm 3 , ethylene-vinyl acetate copolymers, ethylene-ethyl acrylate copolymers and mixtures thereof.
Claim 2
Dependent Claim
91 words
A synthetic resin-coated metallic coil spring which comprises a spring body and a synthetic resin coating containing an olefin polymer modified with an unsaturated carboxylic acid compound which is a member selected from the group consisting of unsaturated carboxylic acids and derivatives thereof, said synthetic resin coating being formed on the surface of said spring body and said olefin polymer being a member selected from the group consisting of ethylene-alpha-olefin copolymers having a density of from 0.86 to 0.94 g/cm 3 , ethylene-vinyl acetate copolymers, ethylene-ethyl acrylate copolymers and mixtures thereof.
Claim 3
Dependent Claim
17 words
A synthetic resin-coated spring according to claim 1 wherein said compound unsaturated carboxylic acid is maleic acid.
Claim 4
Dependent Claim
17 words
A synthetic resin-coated spring according to claim 1, wherein said unsaturated carboxylic acid compound is maleic anhydride.
Claim 5
Dependent Claim
23 words
A synthetic resin-coated spring according to claim 1, wherein said synthetic resin coating has a thickness of from 100 micrometers to 3 mm.
Claim 6
Dependent Claim
35 words
A synthetic resin-coated spring according to claim 1, wherein the modified olefin polymer is an addition product prepared by modifying the olefin polymer with 0.05 to 10 wt % of said unsaturated carboxylic acid compound.
Claim 7
Dependent Claim
20 words
A synthetic resin-coated spring according to claim 1, wherein said synthetic resin coating consists essentially of the modified olefin polymer.
Claim 8
Dependent Claim
36 words
A synthetic resin-coated spring according to claim 1, wherein said synthetic resin coating comprises a mixture of the modified olefin polymer and an unmodified olefin polymer in a mixing ratio by weight of 1:99 to 50:50.
Claim 9
Dependent Claim
19 words
A synthetic resin-coated spring according to claim 7, wherein the ratio is in the range of 10:90 to 45:55.
Claim 10
Dependent Claim
30 words
A synthetic resin-coated spring according to claim 7, wherein said mixture further comprises a member selected from the group consisting of a rubber modified with an unsaturated carboxylic acid compound.
Claim 11
Dependent Claim
27 words
A synthetic resin-coated spring according to claim 1, further comprising a thermosetting resin layer formed between the surface of said spring body and said synthetic resin coating.
Claim 12
Dependent Claim
32 words
A synthetic resin-coated spring according to claim 10, wherein said thermosetting resin is a member selected from the group consisting of epoxy resins, melamine resins, alkyd resins, urethane resins and mixtures thereof.
Claim 13
Dependent Claim
22 words
A synthetic resin-coated spring according to claim 10, wherein said thermosetting resin layer has a thickness of from 5 to 100 micrometers.
Claim 14
Dependent Claim
20 words
The spring according to claim 1 wherein in said copolymer of ethylene and alpha-olefin said alpha-olefin contains 3-12 carbon atoms.
Claim 15
Dependent Claim
17 words
The spring according to claim 1 wherein said olefin polymer has melt index of 0.01-50 g/10 minutes.
Claim 16
Dependent Claim
37 words
A synthetic resin-coated spring according to claim 1, wherein a member selected from the group consisting of a layer of a thermoplastic resin or rubber is further formed on the outer surface of said synthetic resin coating.
References Cited (Backward Citations)
US3985097A
Cited
US4345004A
Cited
JPS5769123A
Cited
US4480008A
Cited
JPS57136971A
Cited
JPS5894647A
Cited
US4407893A
Cited
WO1985000207A1
Cited
US4673620A
Cited
US4612249A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-06-28 | 1991-12-28 | 1992-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-06-28 | 1995-12-28 | 1996-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-06-28 | 1999-12-28 | 2000-06-28 | $7700.00 | Window Closed / Lapsed |