USRE29349E
Expired / Lapsed
US
⏱️ 0.0 years remaining
Organic thermotropic nematic compounds
Assignee: 3M Co
•
Filing: 1975-09-02
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Granted: 1977-08-09
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Expires: 1995-09-02
Abstract
Abstract A new family of organic thermotropic nematic compounds comprising N-(para-substituted alkoxy-benzylidene)-anilines having also a para-n-butyl substituent on the aniline ring. These compounds have the following structural formula: ##STR1## wherein R is a straight chain alkyl group containing 1 to 4 carbon atoms and R' is n-butyl. Synthesis involves combining the desired p-substituted benzaldehyde and p-n-butyl aniline in equimolar proportions in anhydrous ethyl alcohol with glacial acetic acid as catalyst. The resulting homologous series of compounds are useful as materials which undergo a change in optical properties under the influence of externally applied energy, preferred members of which, either individually or in binary mixtures, have melting points near room temperature, a broad nematic mesomorphic temperature range within an overall range of about 0° to about 70° C., low viscosity in the nematic phase, good stability, and substantially no color.
Inventors
- 👤 Elwood L. Strebel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:27
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/08; C09K19/10; C09K19/22; C09K2323/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
2 words
N-(p-methoxybenzylidene)-p-n-butyl aniline.
Claim 2
Dependent Claim
2 words
N-(p-methoxybenzylidene)-p-n-butyl aniline.
Claim 3
Dependent Claim
2 words
N-(p-ethoxybenzylidene)-p-n-butyl aniline.
Claim 4
Dependent Claim
2 words
N-(p-ethoxybenzylidene)-p-n-butyl aniline.
Claim 5
Dependent Claim
2 words
N-(p-n-propoxybenzylidene)-p-butyl aniline.
Claim 6
Dependent Claim
2 words
N-(p-n-propoxybenzylidene)-p-butyl aniline.
Claim 7
Dependent Claim
166 words
N-(p-n-butoxybenzylidene)-p-n-butyl aniline. .Iadd. 5. In a visual display device which incorporates a thermotropic nematic compound for converting energy input into visual form, the improvement which comprises using N-(p-methoxybenzylidene)-p-n-butyl aniline as the nematic compound, whereby the display is effective throughout a wide temperature range. .Iaddend..Iadd. 6. In a visual display device which incorporates a thermotropic nematic compound for converting energy input into visual form, the improvement which comprises using N-(p-ethoxybenzylidene)-p-n-butyl aniline as the nematic compound, whereby the display is effective through a wide temperature range. .Iaddend..Iadd. 7. In a visual display device which incorporates a thermotropic nematic compound for converting energy input into visual form, the improvement which comprises using N-(p-n-propoxybenzylidene)-p-n-butyl aniline as the nematic compound, whereby the display is effective throughout a wide temperature range. .Iaddend..Iadd. 8. In a visual display device which incorporates a thermotropic nematic compound for converting energy input into visual form, the improvement which comprises using N-(p-n-butoxybenzylidene)-p-n-butyl aniline as the nematic compound, whereby the display is effective throughout a wide temperature range.
Claim 8
Dependent Claim
166 words
N-(p-n-butoxybenzylidene)-p-n-butyl aniline. .Iadd. 5. In a visual display device which incorporates a thermotropic nematic compound for converting energy input into visual form, the improvement which comprises using N-(p-methoxybenzylidene)-p-n-butyl aniline as the nematic compound, whereby the display is effective throughout a wide temperature range. .Iaddend..Iadd. 6. In a visual display device which incorporates a thermotropic nematic compound for converting energy input into visual form, the improvement which comprises using N-(p-ethoxybenzylidene)-p-n-butyl aniline as the nematic compound, whereby the display is effective through a wide temperature range. .Iaddend..Iadd. 7. In a visual display device which incorporates a thermotropic nematic compound for converting energy input into visual form, the improvement which comprises using N-(p-n-propoxybenzylidene)-p-n-butyl aniline as the nematic compound, whereby the display is effective throughout a wide temperature range. .Iaddend..Iadd. 8. In a visual display device which incorporates a thermotropic nematic compound for converting energy input into visual form, the improvement which comprises using N-(p-n-butoxybenzylidene)-p-n-butyl aniline as the nematic compound, whereby the display is effective throughout a wide temperature range.
References Cited (Backward Citations)
US3829491A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-08 | 1981-02-07 | 1981-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-08 | 1985-02-07 | 1985-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-08 | 1989-02-07 | 1989-08-09 | $7700.00 | Window Closed / Lapsed |