Patent US3948294A successfully refreshed from Google Patents.
US3948294A
Expired / Lapsed
US
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Impact-protective coating for plastic pipe
Assignee: Ameron Inc
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Filing: 1974-09-16
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Granted: 1976-04-06
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Expires: 1994-09-16
Abstract
Abstract An energy-absorbing protective coating is bonded to the exterior of a plastic pipe. Preferably, the coating is a layer of low-cost, crushable, multicellular, inorganic particles, such as natural volcanic lightweight aggregate, expanded shale, expanded clay, pumice, slag, or furnace cinder, embedded in a thin film of plastic resin. The particles crush by breaking upon impact, which absorbs the energy of the impact and protects the pipe from damage.
Inventors
- 👤 Gerald M. Magarian
- 👤 Robert A. Thompson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:30
CPC Classifications
F; F16; F16L; F16L57/00; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/139; Y10T428/1393
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
115 words
The combination of a plastic pipe, a film of bonding material on the pipe exterior surface, and an outer layer of crushable, multicellular, inorganic particles selected from the group consisting of natural volcanic lightweight aggregate, expanded shale, expanded clay, pumice, slag, and furnace cinder, or mixtures thereof, embedded in the bonding material so as to cover the exterior surface of the pipe, the particles being of substantially greater thickness than the film of bonding material so that the unembedded portions of the particles project away from the pipe body to provide a multicellular, inorganic coating which crushes by breaking to absorb energy upon impact and provides a level of impact protection for the pipe body.
Claim 2
Dependent Claim
115 words
The combination of a plastic pipe, a film of bonding material on the pipe exterior surface, and an outer layer of crushable, multicellular, inorganic particles selected from the group consisting of natural volcanic lightweight aggregate, expanded shale, expanded clay, pumice, slag, and furnace cinder, or mixtures thereof, embedded in the bonding material so as to cover the exterior surface of the pipe, the particles being of substantially greater thickness than the film of bonding material so that the unembedded portions of the particles project away from the pipe body to provide a multicellular, inorganic coating which crushes by breaking to absorb energy upon impact and provides a level of impact protection for the pipe body.
Claim 3
Dependent Claim
18 words
The combination according to claim 1 in which the plastic pipe is made from a thermosetting resinous material.
Claim 4
Dependent Claim
35 words
The combination according to claim 1 in which the film of bonding material is between about 0.015 to about 0.025 inch thick, and the outer layer of particles is at least about one-sixteenth inch thick.
Claim 5
Dependent Claim
23 words
The combination according to claim 1 in which the outer layer of particles is between about one-sixteenth to about one-fourth inch in thickness.
Claim 6
Dependent Claim
22 words
The combination according to claim 4 in which the film of bonding material is between about 0.015 to about 0.025 inch thick.
Claim 7
Dependent Claim
31 words
The combination according to claim 5 in which the particles are distributed uniformly about the pipe surface in a single layer which covers substantially the entire exterior surface of the pipe.
Claim 8
Dependent Claim
100 words
A plastic pipe having a particulate, inorganic, multicellular crushable outer coating of particles selected from the group consisting of natural volcanic lightweight aggregate, expanded shale, expanded clay, pumice, slag, and furnace cinder, or mixtures thereof, embedded in a thin film of bonding material covering the exterior surface of the pipe, the particles being of sufficient thickness that a major portion of the particles projects freely away from the film of bonding material to form an impact protective outer layer which crushes by breaking apart to absorb energy upon impact and provide a level of impact protection for the pipe body.
Claim 9
Dependent Claim
100 words
A plastic pipe having a particulate, inorganic, multicellular crushable outer coating of particles selected from the group consisting of natural volcanic lightweight aggregate, expanded shale, expanded clay, pumice, slag, and furnace cinder, or mixtures thereof, embedded in a thin film of bonding material covering the exterior surface of the pipe, the particles being of sufficient thickness that a major portion of the particles projects freely away from the film of bonding material to form an impact protective outer layer which crushes by breaking apart to absorb energy upon impact and provide a level of impact protection for the pipe body.
Claim 10
Dependent Claim
23 words
A plastic pipe according to claim 7 in which the outer layer of particles is between about one-sixteenth to about one-fourth inch thick.
Claim 11
Dependent Claim
36 words
A plastic pipe according to claim 7 in which the film of bonding material is between about 0.015 to about 0.025 inch thick, and the outer layer of particles is at least about one-sixteenth inch thick.
Claim 12
Dependent Claim
131 words
The combination of a plastic pipe, a film of bonding material on the pipe exterior surface, and an outer layer of crushable, multicellular, inorganic particles selected from the group consisting of natural volcanic lightweight aggregate, expanded shale, expanded clay, pumice, slag, and furnace cinder, or mixtures thereof, embedded in the bonding material so as to cover the exterior surface of the pipe, the film of bonding material being about 0.015 to about 0.025 inch in thickness, and the outer layer of particles being between about one-sixteenth to about one-fourth inch thick so the unembedded portions of the particles project away from the pipe body to form a multicellular inorganic protective coating which crushes by breaking to absorb energy upon impact and provides a level of impact protection for the pipe body.
Claim 13
Dependent Claim
131 words
The combination of a plastic pipe, a film of bonding material on the pipe exterior surface, and an outer layer of crushable, multicellular, inorganic particles selected from the group consisting of natural volcanic lightweight aggregate, expanded shale, expanded clay, pumice, slag, and furnace cinder, or mixtures thereof, embedded in the bonding material so as to cover the exterior surface of the pipe, the film of bonding material being about 0.015 to about 0.025 inch in thickness, and the outer layer of particles being between about one-sixteenth to about one-fourth inch thick so the unembedded portions of the particles project away from the pipe body to form a multicellular inorganic protective coating which crushes by breaking to absorb energy upon impact and provides a level of impact protection for the pipe body.
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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) | 1979-04-06 | 1979-10-06 | 1980-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-06 | 1983-10-06 | 1984-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-06 | 1987-10-06 | 1988-04-06 | $7700.00 | Window Closed / Lapsed |