US4022626A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Structural material
Assignee: United States Department of the Interior
•
Filing: 1975-08-22
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Granted: 1977-05-10
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Expires: 1995-08-22
Abstract
Abstract A composite structural material is prepared by admixing (1) sulfur plasticized by reaction with dicyclopentadiene, or dicyclopentadiene and styrene, (2) asbestos fibers wetted with dipentene and (3) silica flour, maintaining the mixture at about 120 to 150 DEG C for about 0.5 to 5 minutes and casting the resulting product under a pressure of about 500 to 1500 psi. Additional strength is obtained by curing at elevated temperature prior to casting.
Inventors
- 👤 William C. McBee
- 👤 Thomas A. Sullivan
- 👤 Oliver B. Patrick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:34
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/36
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
123 words
A process for preparation of a composite structural material comprising compounding the following ingredients: (1) plasticized sulfur prepared by reaction of about 45 to 55 percent elemental sulfur with about 1 to 10 percent of dicyclopentadiene at a temperture of about 120° to 150° C for a period of about 2 hours to 15 minutes, (2) about 8 to 12 percent of asbestos fibers wetted with about 0.5 to 5 percent dipentene and (3) about 25 to 40 percent silica flour; mixing the three ingredients at a temperature of about 120° to 150° C for a period of about 0.5 to 5 minutes; casting the admixture under a pressure of about 500 to 1500 psi and cooling the resultant composite to room temperature.
Claim 2
Dependent Claim
123 words
A process for preparation of a composite structural material comprising compounding the following ingredients: (1) plasticized sulfur prepared by reaction of about 45 to 55 percent elemental sulfur with about 1 to 10 percent of dicyclopentadiene at a temperture of about 120° to 150° C for a period of about 2 hours to 15 minutes, (2) about 8 to 12 percent of asbestos fibers wetted with about 0.5 to 5 percent dipentene and (3) about 25 to 40 percent silica flour; mixing the three ingredients at a temperature of about 120° to 150° C for a period of about 0.5 to 5 minutes; casting the admixture under a pressure of about 500 to 1500 psi and cooling the resultant composite to room temperature.
Claim 3
Dependent Claim
33 words
The process of claim 1 in which mixture of ingredients is cured at a temperature of about 120° to 140° C for a period of about 1 to 48 hours prior to casting.
Claim 4
Dependent Claim
20 words
The process of claim 1 in which the sulfur is plasticized by means of a combination of dicyclopentadiene and styrene.
Claim 5
Dependent Claim
11 words
A composite structural material prepared by the process of claim 1.
References Cited (Backward Citations)
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US3304197A
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US3053680A
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US3356779A
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US3465064A
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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) | 1980-05-09 | 1980-11-08 | 1981-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-09 | 1984-11-08 | 1985-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-09 | 1988-11-08 | 1989-05-10 | $7700.00 | Window Closed / Lapsed |