US3967020A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coated metal pipe
Assignee: Tosoh Corp
•
Filing: 1974-11-20
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Granted: 1976-06-29
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Expires: 1994-11-20
Abstract
Abstract A coated metal pipe which comprises a pipe coated with a composition comprising 5-30 wt parts of ethylene-vinylacetate copolymer having a vinylacetate content of 15-40 wt% and a melt index of 1-1,000 g/10 min; 2-20 wt parts of low molecular weight oxidized polymer of polypropylene or propylene-ethylene copolymer; 5-40 wt parts of styrene butadiene copolymer; 5-50 wt parts of a tackifier and 10-80 wt parts of asphalt.
Inventors
- 👤 Masaru Uemura
- 👤 Hitoshi Kuroki
- 👤 Nobuhiro Echida
- 👤 Yujiro Kosaka
- 👤 Kanji Otomo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:21
CPC Classifications
B; B05; B05D; B05D7/00; B05D7/14; B05D7/146; F; F16; F16L; F16L58/00; F16L58/02; F16L58/04; F16L58/10; F16L58/1054; F16L58/109; F16L58/12; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/1355; Y10T428/1359; Y10T428/31504; Y10T428/31678; Y10T428/31692; Y10T428/31696; Y10T428/31699; Y10T428/31714; Y10T428/31717; Y10T428/31815
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
69 words
A coated metal pipe which comprises a pipe coated with a composition comprising 5-30 wt parts of ethylene-vinylacetate copolymer having a vinylacetate content of 15-40 wt% and a melt index of 1-1000 g/10 min; 2-20 wt parts of low molecular weight oxidized polymer of ethylene-vinylacetate copolymer, polypropylene or propylene-ethylene copolymer; 5-30 wt parts of styrene-butadiene copolymer; 5-50 wt parts of a rosin tackifier and 10-80 wt parts of asphalt.
Claim 2
Dependent Claim
69 words
A coated metal pipe which comprises a pipe coated with a composition comprising 5-30 wt parts of ethylene-vinylacetate copolymer having a vinylacetate content of 15-40 wt% and a melt index of 1-1000 g/10 min; 2-20 wt parts of low molecular weight oxidized polymer of ethylene-vinylacetate copolymer, polypropylene or propylene-ethylene copolymer; 5-30 wt parts of styrene-butadiene copolymer; 5-50 wt parts of a rosin tackifier and 10-80 wt parts of asphalt.
Claim 3
Dependent Claim
22 words
The coated metal pipe of claim 1, wherein said low molecular weight oxidized polymer is a low molecular weight oxidized propylene-ethylene copolymer.
Claim 4
Dependent Claim
22 words
The coated metal pipe of claim 1, wherein said low molecular weight oxidized polymer is a low molecular weight oxidized ethylene-vinylacetate copolymer.
Claim 5
Dependent Claim
21 words
The coated metal pipe of claim 1, wherein said low molecular weight oxidized polymer is a low molecular weight oxidized polypropylene.
Claim 6
Dependent Claim
26 words
The coated metal pipe of claim 1, wherein the composition is coated onto the surface of a pipe, the coating having a thickness of 0.1-5 mm.
Claim 7
Dependent Claim
28 words
The coated metal pipe of claim 1, wherein the metal pipe coated with the composition is overcoated with a polyolefin thermoplastic resin having a thickness of 0.1-10 mm.
Claim 8
Dependent Claim
33 words
The coated metal pipe of claim 1, wherein said low molecular weight oxidized polymer has a molecular weight of 400-5000 and an acid value of 1-20 measured by the dioxane tetralin solvent method.
Claim 9
Dependent Claim
31 words
The coated metal pipe of claim 1, wherein the composition is heat-melt coated onto the metal pipe body at 100°-250°C to form a coated layer having a thickness of 0.1-10 mm.
Claim 10
Dependent Claim
28 words
The coated metal pipe of claim 1, wherein the tackifier is rosin, rosin polymer, rosin polyol ester, hydrogenated rosin, hydrogenated rosin polyol ester, petroleum resin or terpene resin.
Claim 11
Dependent Claim
17 words
The coated pipe of claim 1, wherein the coated layer is overcoated with a polyolefin thermoplastic resin.
Claim 12
Dependent Claim
62 words
A coating for metal pipe which comprises 5-30 wt parts of ethylene-vinylacetate copolymer having a vinylacetate content of 15-40 wt% and a melt index of 1-1000 g/10min; 2-20 wt% parts of low molecular weight oxidized polymer of ethylene-vinylacetate copolymer, polypropylene or propylene-ethylene copolymer; 5-30 wt parts of styrene-butadiene copolymer; 5-50 wt parts of a rosin tackifier and 10-80 wt parts of asphalt.
Claim 13
Dependent Claim
62 words
A coating for metal pipe which comprises 5-30 wt parts of ethylene-vinylacetate copolymer having a vinylacetate content of 15-40 wt% and a melt index of 1-1000 g/10min; 2-20 wt% parts of low molecular weight oxidized polymer of ethylene-vinylacetate copolymer, polypropylene or propylene-ethylene copolymer; 5-30 wt parts of styrene-butadiene copolymer; 5-50 wt parts of a rosin tackifier and 10-80 wt parts of asphalt.
Claim 14
Dependent Claim
20 words
The coating of claim 11, wherein said low molecular weight oxidized polymer is a low molecular weight oxidized propylene-ethylene copolymer.
Claim 15
Dependent Claim
20 words
The coating of claim 11, wherein said low molecular weight oxidized polymer is a low molecular weight oxidized ethylene-vinylacetate copolymer.
Claim 16
Dependent Claim
19 words
The coating of claim 11, wherein said low molecular weight oxidized polymer is a low molecular weight oxidized polypropylene.
Claim 17
Dependent Claim
31 words
The coating of claim 11, wherein said low molecular weight oxidized polymer has a molecular weight of 400-5000 and an acid value of 1-20, measured by the dioxane tetralin solvent method.
Claim 18
Dependent Claim
26 words
The coating of claim 11, wherein the tackifier is rosin, rosin polymer, rosin polyol ester, hydrogenated rosin, hydrogenated rosin polyol ester, petroleum resin or terpene resin.
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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) | 1979-06-29 | 1979-12-29 | 1980-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-29 | 1983-12-29 | 1984-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-29 | 1987-12-29 | 1988-06-29 | $7700.00 | Window Closed / Lapsed |