An  improvement  in  stoves,  consisting  in  the  substitution  of  a
flat  grate  for  a  dished  grate  (Perry  v.  Co-operative  Foundry  Co.,
12  Fed.  Bep'r,  149) ;  or  the  substitution  of  an  old  grate  made  in  two
parts  for  another  old  grate  made  in  one  part.     Id.  4.36.
A  can  adapted  to  hold  liquids,  constructed  after  a  device  previ-
ously patented  for  a  can  to  hold  dry  substances.  Norton  «.  Haight,
22  Fed.  Bep'r,  187.
A  composition  for  an  artificial  ivory,  consisting  of  a  mechanical
mixture  of  kaolin  and  shellac  ;  where  it  appeared  that  the  use  of


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308  UNITED  STATES  LAWS.
those  ingredients  in  combination  was  not  new,  and  that  the  propor-
tions stated  in  the  patent  did  not  produce  any  new  or  useful
result.  Welling  v.  Crane,  21  JFed.  Bep\l01 ;  29  Pat.  Off.  Gaz.
451.-

Alleged  improvements  in  dissolving  xyloidine,  consisting  in  the
use  of  camphor  in  conjunction  with  alcohol  as  a  solvent ;  and  in
bleaching  zyloidine,  consisting  in  the  application  of  ordinary  bleach-
ing materials,  which  had  not  before  been  used.  Spill  v.  Celluloid
Manuf.  Co.,  22  Blatchf.  441  ;  21  Fed.  RepW,  631.
An  improvement  in  sectional  honey-frames,  consisting  of  making
them  by  bending  and  uniting  the  ends  of  a  blank  consisting  of  a
single  piece.  Forncrook  v.  Root,  21  Fed.  Bep'r,  328  ;  29  Pat.  Off.
Gaz.  775.
Application  to  the  turning  of  machine  awls  and  needles,  from
metal,  of  mechanism  old  and  familiar  in  the  art  of  wood-turning.
Howe  Machine  Co.  v.  National  Needle  Co.,  21  Fed.  Bep'r,  630.
