US4011274A
Expired / Lapsed
US
⏱️ 0.0 years remaining
1,1-diphenyl ethane process
Assignee: Asahi Kasei Corp
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Filing: 1976-05-19
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Granted: 1977-03-08
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Expires: 1996-05-19
Abstract
Abstract A novel heating medium comprising 1,1-diphenyl ethane is provided for use in heating processes. Said heating medium has good thermal stability, a high boiling point and a low melting point. It is applicable over a wide range of temperatures and easily degradable by microorganisms. The oily substances, by-produced in the step of separating ethyl benzene from polyalkyl benzenes in production of ethyl benzene from the reaction between benzene and ethylene, may be available for preparation of said heating medium.
Inventors
- 👤 Masaaki Watanabe
- 👤 Masao Hasegawa
- 👤 Jiroe Yamada
- 👤 Kouichi Kobayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:45
CPC Classifications
C; C09; C09K; C09K5/00; C09K5/08; C09K5/10; C07; C07C; C07C15/00; C07C15/12; C07C15/16
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
36 words
A process for obtaining 1,1-diphenyl ethane, which comprises reacting ethylene and benzene to form ethyl benzene and high boiling by-products, and fractionally distilling said higher boiling by-products and recovering a fraction consisting essentially of 1,1-diphenyl ethane.
Claim 2
Dependent Claim
36 words
A process for obtaining 1,1-diphenyl ethane, which comprises reacting ethylene and benzene to form ethyl benzene and high boiling by-products, and fractionally distilling said higher boiling by-products and recovering a fraction consisting essentially of 1,1-diphenyl ethane.
Claim 3
Dependent Claim
31 words
The process of claim 1, wherein a fraction containing 1,1-diphenyl ethane and up to 55 percent by weight of hydrocarbons having a lower boiling point than 1,1-diphenyl ethane is so recovered.
Claim 4
Dependent Claim
31 words
The process of claim 1, wherein a fraction containing 1,1-diphenyl ethane and up to 35 percent by weight of hydrocarbons having a higher boiling point than 1,1-diphenyl ethane is so recovered.
Claim 5
Dependent Claim
47 words
The process of claim 1, wherein a fraction containing 1,1-diphenyl ethane, up to 55 percent by weight of hydrocarbons having a lower boiling point than 1,1-diphenyl ethane, and up to 35 percent by weight of hydrocarbons having a higher boiling point than 1,1-diphenyl ethane, is so recovered.
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) | 1980-03-07 | 1980-09-06 | 1981-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-07 | 1984-09-06 | 1985-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-07 | 1988-09-06 | 1989-03-08 | $7700.00 | Window Closed / Lapsed |