US3607511A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite reinforced plastic pipe
Assignee: Contech Engineered Solutions LLC
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Filing: 1969-06-25
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Granted: 1971-09-21
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Expires: 1989-06-25
Abstract
Abstract A process for providing reinforced plastic pipe wherein particulate material is incorporated in the resin matrix between the layers of continuous filaments. The particulate material is applied in a bimodal manner with coarse particles being applied first and fine particles applied over the coarse particles to fill the spaces therebetween.
Inventors
- 👤 James L Grosh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:55
CPC Classifications
B; B29; B29C; B29C41/00; B29C41/02; B29C41/08; B29C41/085; B29C70/00; B29C70/02; B29C70/021; B29C70/025; F; F16; F16L; F16L9/00; F16L9/16
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
17 words
The method of claim 1 wherein said filamentary material is glass and said particulate material is sand.
Claim 2
Dependent Claim
53 words
The method of claim 1 wherein substantially all of the particles contained in said first discrete source have a size in the range from 8 mesh to 64 mesh and substantially all of the particles contained in said second group have a size in the range of from 100 mesh to 5 micron.
Claim 3
Dependent Claim
53 words
The method of claim 2 wherein substantially all of the particles contained in said first discrete source have a size in the range from 8 mesh to 64 mesh and substantially all of the particles contained in said second group have a size in the range of from 100 mesh to 5 micron.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |