 Method and apparatus for accurate, high speed pulse-echo measurement calibration |
| An apparatus for time-based measurements comprises, in general form, a receiver for receiving an ... |
|
| Anhydrous kaolin clay pigment and method of preparation |
| We claim: 1. An anhydrous white kaolin clay pigment having high light scattering when incorporated ... |
|
| Pressure-contact sealing arrangement for a semiconductor pellet |
| It is an object of the present invention to provide a semiconductor device which simplifies the ... |
|
| Means for mounting membrane switches to cathode ray tubes |
| What is claimed is: 1. A membrane switch having mounting means for mounting the switch to a cathode ... |
|
| Imaging apparatus |
| The present invention has been made in an attempt to solve the above-described problems of the ... |
|
| Image inputting device for endoscope |
| The present invention is directed to overcoming the above-described problems of the prior art, and ... |
|
| Movement detection and y/c separation circuit for detecting a movement in a television display picture |
| In view of the shortcomings of the above-described device in the related art, a primary object of ... |
|
| Semiconductor component with pressure contact |
| The present invention provides a semiconductor device of the above-mentioned type in such a way ... |
|
| Closure for semiconductor device and method of construction |
| OF THE INVENTION A semiconductor device constructed according to the invention is shown in FIG. 1 ... |
|
|
6-tetrahydrofurfurylaminofluoran compound useful as a color former
| Details |
Inventors: Sensui, Hideyuki; Suzuka, Susumu; Gonda, Michihiro; Kikkawa, Katsumasa;
Assignee: Hodogaya Chemical Co., Ltd. (Tokyo, JP)
Primary Examiner:
Assistant Examiner:
Attorney, Agent or Firm:
A novel 6-tetrahydrofurfurylaminofluoran compound useful as a color former (precursory colorant) for a heat-sensitive recording sheet is of the formula (I): ##STR1## wherein R.sub.1 is H, C.sub.1-8 alkyl, tetrahydrofurfuryl, phenyl, alkyl(C.sub.1-5)phenyl, or C.sub.3-8 cyclic alkyl, R.sub.2 is H, Cl, F, C.sub.1-5 alkyl, C.sub.1-5 alkoxy, C.sub.2-10 alkoxyalkyl, phenyl or benzyl, and R.sub.3 is H, Cl, F, C.sub.1-5 alkyl and C.sub.2-7 acryl. |
|
DETAILED DESCRIPTION We claim: 1.
A 6-tetrahydrofurfurylaminofluoran compound of the formula (I): R1 ? ? ##STR24## wherein R.
sub.
1 represents a member selected from the group consisting of a hydrogen atom, alkyl radicals having 1 to 8 carbon atoms, a tetrahydrofurfuryl radical, a phenyl radical, an alkylphenyl radical in which the alkyl group has 1 to 5 carbon atoms, and cyclic alkyl radicals having 3 to 8 carbon atoms; R.
sub.
2 represents a member selected from the group consisting of a hydrogen atom, chlorine atom, fluorine atom, alkyl radicals having 1 to 5 carbon atoms, alkoxy radicals having 1 to 5 carbon atoms, alkoxyalkyl radicals having 2 to 10 carbon atoms, a phenyl radical, and a benzyl radical; and R.
sub.
3 represents a hydrogen atom, chlorine atom, fluorine atom, alkyl radicals having 1 to 5 carbon atoms, and acyl radicals having 2 to 7 carbon atoms.
2.
The fluoran compound as claimed in claim 1, selected from 2-anilino-3-methyl-6-N-methyl-N-tetrahydrofurfurylaminofluoran, 2-anilino-3-methyl-6-N-ethyl-N-tetrahydrofurfurylaminofluoran, 2-anilino-3-chloro-6-N-methyl-N-tetrahydrofurfurylaminofluoran, 2-(2-chloroanilino)-6-N-methyl-N-tetrahydrofurfurylaminofluoran, 2-(2-chloroanilino)-6-N,N-ditetrahydrofurfurylaminofluoran, 2-anilino-3-methyl-6-N,N-ditetrahydrofurfurylaminofluoran, 2-anilino-3-methyl-6-N-isoamyl-N-tetrahydrofurfurylaminofluoran, 2-anilino-3-methyl-6-N-butyl-N-tetrahydrofurfurylaminofluoran, 2-anilino-3-ethoxyethyl-6-N-methyl-N-tetrahydrofurfurylaminofluoran, 2-anilino-3-methyl-N-p-tolyl-N-tetrahydrofurfurylaminofluoran, 2-anilino-3-methyl-6-N-cyclohexyl-N-tetrahydrofurfurylaminofluoran, 2-anilino-3-methyl-N-tetrahydrofurfurylaminofluoran, 2-anilino-3-phenyl-6-N-methyl-N-tetrahydrofurfurylaminofluoran, 2-anilino-3-phenyl-6-N-ethyl-N-tetrahydrofurfurylaminofluoran, 2-anilino-3-benzyl-6-N-methyl-N-tetrahydrofurfurylaminofluoran, 2-anilino-3-methoxy-6-N-methyl-N-tetrahydrofurfurylaminofluoran, 2-p-toluidino-3-methyl-6-N-methyl-N-tetrahydrofurfurylaminofluoran, 2-(p-benzoyl-phenylamino)-3-ethyl-6-N-methyl-N-tetrahydrofurfurylaminofluo ran, 2-(2-fluoroanilino)-6-N-methyl-N-tetrahydrofurfurylaminofluoran, and 2-anilino-3-benzyl-6-N,N-ditetrahydrofurfurylaminofluoran
|
|
TV Signal 
