US4795604A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for molding 1,4,4a,9a-tetrahydroanthraquinone
Assignee: Kawasaki Kasei Chemicals Ltd
•
Filing: 1987-06-10
•
Granted: 1989-01-03
•
Expires: 2007-06-10
Abstract
Abstract A method for molding 1,4,4a,9a-tetrahydroanthraquinone by cooling and solidifying a melt of 1,4,4a,9a-tetrahydroanthraquinone, which comprises contacting the melt with a cooling surface of a temperature of from about 50 DEG to about 80 DEG C. for solidification, and peeling off the solidified product.
Inventors
- 👤 Katsumi Matsuzaki
- 👤 Kenji Usui
- 👤 Seishi Ikemoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:25
CPC Classifications
B; B01; B01J; B01J2/00; B01J2/26; B29; B29B; B29B9/00; B29B9/10; C; C07; C07C; C07C49/00; C07C49/587; C07C49/657; C07C49/683
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
41 words
A method for molding 1,4,4a,9a-tetrahydroanthraquinone by cooling and solidifying a melt of 1,4,4a,9a-tetrahydroanthraquinone, which comprises contacting the melt with a cooling surface at a temperature of from about 50° to about 80° C. for solidification, and peeling off the solidified product.
Claim 2
Independent Claim
41 words
A method for molding 1,4,4a,9a-tetrahydroanthraquinone by cooling and solidifying a melt of 1,4,4a,9a-tetrahydroanthraquinone, which comprises contacting the melt with a cooling surface at a temperature of from about 50° to about 80° C. for solidification, and peeling off the solidified product.
Claim 3
Dependent Claim
15 words
The method according to claim 1, wherein 1,4,4a,9a-tetrahydroanthraquinone is obtained by reacting naphthoquinone with butadiene.
Claim 4
Dependent Claim
38 words
The method according to claim 1, wherein the melt is obtained by reacting naphthoquinone with butadiene in an inert organic solvent to obtain a reaction solution composed mainly of 1,4,4a,9a-tetrahydroanthraquinone, and distilling the solvent off the reaction solution.
Claim 5
Dependent Claim
16 words
The method according to claim 3, wherein the inert organic solvent is a lower aromatic hydrocarbon.
Claim 6
Dependent Claim
17 words
The method according to claim 4 wherein the lower aromatic hydrocarbon is benzene, toluene, xylene or ethylbenzene.
Claim 7
Dependent Claim
11 words
The method according to claim 5, wherein the xylene is o-xylene.
Claim 8
Dependent Claim
24 words
The method according to claim 3, wherein the content of the organic solvent in the melt is not higher than about 5% by weight.
Claim 9
Dependent Claim
23 words
The method according to claim 3, wherein the content of the organic solvent in the melt is not higher than 3% by weight.
Claim 10
Dependent Claim
21 words
The method according to claim 3, wherein the content of the organic solvent in the melt is not higher than 1%.
Claim 11
Independent Claim
62 words
A method for molding 1,4,4a,9a-tetrohydroanthroquinone by cooling and solidifying a melt of 1,4,4a,9a-tetrahydroanthraquinone, which comprises firstly contacting the melt with a cooling surface of a temperature of lower than about 50° C. and higher than about 40° C. for solidification, then heating the cooling surface to a temperature of from about 50° to about 80° C., and peeling off the solidified product.
Claim 12
Independent Claim
62 words
A method for molding 1,4,4a,9a-tetrohydroanthroquinone by cooling and solidifying a melt of 1,4,4a,9a-tetrahydroanthraquinone, which comprises firstly contacting the melt with a cooling surface of a temperature of lower than about 50° C. and higher than about 40° C. for solidification, then heating the cooling surface to a temperature of from about 50° to about 80° C., and peeling off the solidified product.
Claim 13
Dependent Claim
18 words
The method according to claim 1, wherein said cooling surface is at a temperature of about 50°-70° C.
Claim 14
Dependent Claim
18 words
The method according to claim 1, wherein said cooling surface is at a temperature of about 50°-60° C.
Claim 15
Dependent Claim
18 words
The method according to claim 10, wherein said cooling surface is at a temperature of about 50°-70° C.
Claim 16
Dependent Claim
18 words
The method according to claim 10, wherein said cooling surface is at a temperature of about 50°-60° C.
Claim 17
Dependent Claim
30 words
The method according to claim 10, wherein after the melt is contacted with a cooling surface, the cooling surface is heated to a temperature of about 60° to 80° C.
References Cited (Backward Citations)
US1088741A
Cited
US1813268A
Cited
US3221087A
Cited
US3405209A
Cited
US3689619A
Cited
JPS549256A
Cited
US4407840A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-01-03 | 1992-07-04 | 1993-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-01-03 | 1996-07-04 | 1997-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-01-03 | 2000-07-04 | 2001-01-03 | $7700.00 | Window Closed / Lapsed |