US4123219A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chemical storage of radiant energy
Assignee: Commonwealth Scientific and Industrial Research Organisation
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Filing: 1976-09-17
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Granted: 1978-10-31
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Expires: 1996-09-17
Abstract
Abstract A method for the chemical storage of radiant energy in which substituted naphthalenes undergo photochemical dimerization by exposure to radiant energy to form 1,2,2a,7,8,12b-hexahydro-1,8,2,7-ethanedihylidenedibenzo[a,e]cyclobuta [c]cyclooctenes, which on heating, revert to the original naphthalenes with the release of heat.
Inventors
- 👤 Wolfgang H. F. Sasse
- 👤 Tsutomu Teitei
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:10
CPC Classifications
C; C09; C09K; C09K5/00; C09K5/16
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
123 words
A method for generating heat which comprises exposing compounds of formula (4) to radiant energy to form a compound of formula (5) ##STR1## wherein in formula (4) and (5) R 3' is hydrogen, an alkoxy group (up to C3) or an ester (COOR, where R is methyl, ethyl, or propyl); each of R 1' , R 2' and R 4' is hydrogen, alkoxy (up to C3), ester (COOR where R is methyl, ethyl or propyl), nitrile, alkyl (up to C4), fluoro or chloro provided that one or two of the groups R 1' to R 4' is hydrogen; or anhydrides of the naphthoic acids corresponding to the compound (4); heating compound (5) to release the energy as heat and reform the compounds (4).
Claim 2
Independent Claim
123 words
A method for generating heat which comprises exposing compounds of formula (4) to radiant energy to form a compound of formula (5) ##STR1## wherein in formula (4) and (5) R 3' is hydrogen, an alkoxy group (up to C3) or an ester (COOR, where R is methyl, ethyl, or propyl); each of R 1' , R 2' and R 4' is hydrogen, alkoxy (up to C3), ester (COOR where R is methyl, ethyl or propyl), nitrile, alkyl (up to C4), fluoro or chloro provided that one or two of the groups R 1' to R 4' is hydrogen; or anhydrides of the naphthoic acids corresponding to the compound (4); heating compound (5) to release the energy as heat and reform the compounds (4).
Claim 3
Dependent Claim
24 words
A method as claimed in claim 1, wherein in the exposure to radiant energy and/or heating steps the compounds are dissolved in a solvent.
Claim 4
Dependent Claim
14 words
A method as claimed in claim 2, wherein the solvent is cyclohexane or benzene.
Claim 5
Dependent Claim
27 words
A method as claimed in claim 1, wherein during the exposure to radiant energy of compound (4) the temperature of the compounds is maintained below 50° C.
Claim 6
Dependent Claim
24 words
A method as claimed in claim 1, wherein the radiant energy is derived from light of a wavelength between about 300 and 400 nm.
Claim 7
Dependent Claim
16 words
A method as claimed in claim 1, wherein the radiant energy is derived from solar radiation.
Claim 8
Dependent Claim
22 words
A method as claimed in claim 1, wherein the exposure to radiant energy is carried out in the substantial absence of oxygen.
Claim 9
Dependent Claim
21 words
A method as claimed in claim 1, wherein the compound (5) is heated to a temperature of at least 180° C.
Claim 10
Dependent Claim
14 words
A method as claimed in claim 1, wherein the compounds (4) are differently substituted.
Claim 11
Dependent Claim
26 words
A method as claimed in claim 1, wherein in the exposure to radiant energy and/or the heating steps, the compounds are in liquid or solid form.
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) | 1981-10-30 | 1982-05-01 | 1982-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-30 | 1986-05-01 | 1986-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-30 | 1990-05-01 | 1990-10-31 | $7700.00 | Window Closed / Lapsed |