Patent US4155771A successfully refreshed from Google Patents.
US4155771A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plasticized sulfur with improved stability
Assignee: Sunoco Inc R&M
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Filing: 1978-04-03
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Granted: 1979-05-22
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Expires: 1998-04-03
Abstract
Abstract Sulfur is plasticized by the addition of 1,4,4a,5,8,8a-hexahydro-1,4,5,8-exo,endo-dimethanonaphthalene which is an adduct of norbornadiene and cyclopentadiene.
Inventors
- 👤 Richard D. Cassar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:57
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/36; C01; C01B; C01B17/00; C01B17/02; C01B17/0243; C04; C04B; C04B28/00; C04B28/36
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
48 words
A process for plasticizing sulfur to obtain a flexible product which comprises adding with thorough mixing 1,4,4a,5,8,8a-hexahydro-1,4,5,8-exo-endo-dimethanonaphthalene to molten sulfur held at a temperature of at least about 150° C., said 1,4,4a,5,8,8a-exo-endo-dimethanonaphthalene being added in an amount of from about 5% to about 50% by weight of sulfur.
Claim 2
Dependent Claim
48 words
A process for plasticizing sulfur to obtain a flexible product which comprises adding with thorough mixing 1,4,4a,5,8,8a-hexahydro-1,4,5,8-exo-endo-dimethanonaphthalene to molten sulfur held at a temperature of at least about 150° C., said 1,4,4a,5,8,8a-exo-endo-dimethanonaphthalene being added in an amount of from about 5% to about 50% by weight of sulfur.
Claim 3
Dependent Claim
23 words
The process of claim 1 where the 1,4,4a,5,8,8a-hexahydro-1,4,5,8-exo,endo-dimethanonaphthalene is added in an amount from about 15% to about 50% by weight of sulfur.
Claim 4
Dependent Claim
38 words
A plasticized sulfur composition obtained by adding with thorough mixing 1,4,4a,5,8,8a-exo-endo-dimethanonaphthalene to molten sulfur at a temperature of at least about 150° C., in an amount of from about 5% to about 50% by weight of said sulfur.
Claim 5
Dependent Claim
38 words
A plasticized sulfur composition obtained by adding with thorough mixing 1,4,4a,5,8,8a-exo-endo-dimethanonaphthalene to molten sulfur at a temperature of at least about 150° C., in an amount of from about 5% to about 50% by weight of said sulfur.
Claim 6
Dependent Claim
23 words
The sulfur composition of claim 3 where the added 1,4,4a,5,8,8a-hexahydro-1,4,5,8-exo,endo-dimethanonaphthalene is in the amount of from about 15% to about 50% of sulfur.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-05-21 | 1982-11-20 | 1983-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-05-21 | 1986-11-20 | 1987-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-05-21 | 1990-11-20 | 1991-05-22 | $7700.00 | Window Closed / Lapsed |