US Patent Class 400
TYPEWRITING MACHINES-- Main Headings




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Current as of: June, 1999
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CLASS NOTES
1  DF  INCLUDING JUSTIFICATION OR QUADDING OF PRINT-LINE {6}
16  DF  FOR TYPING OR FORMING CONTINUOUS OR DISCONTINUOUS LINE (E.G., BY "LINER") {4}
23  DF  FOR TYPING ON FLAT RECORD-MEDIUM OR AGAINST FLAT PLATEN {14}
50  DF  INCLUDING DELAY MEANS FOR PREVENTING MALFUNCTION IN POWERED TYPEWRITER {2}
53  DF  INCLUDING ADJUSTMENT MEANS TO COMPENSATE FOR WEAR
54  DF  SAFETY SWITCH OR CONDITION-RESPONSIVE-CUTOFF SWITCH FOR ELECTRICALLY POWERED TYPEWRITER
55  DF  INCLUDING ADJUSTMENT FOR OPTIMUM PRINTING PLANE {4}
61  DF  INCLUDING CONTROL OF FORMAT AND SELECTION OF TYPE-FACE BY PROGRAMMED CONTROL-SYSTEM (E.G., INPUT TYPEWRITER) {7}
70  DF  INCLUDING SELECTION OF TYPE-FACE BY PROGRAMMED-CONTROL-SYSTEM OR BY REMOTE CONTROL {5}
76  DF  INCLUDING CONTROL OF FORMAT BY PROGRAMMED-CONTROL-SYSTEM
77  DF  TYPEWRITER CONTROLS OTHER INFORMATION RECORDER {2}
82  DF  INCLUDING PLURAL, INDEPENDENTLY SUPPORTED KEY-BOARDS, PLATENS, OR TYPE-SET ASSEMBLAGES
83  DF  DISPLAYING TYPEWRITER-FORMED REPRESENTATION OF PRINT-LINE {1}
86  DF  OPERATING BY SOUND
87  DF  FOR OPERATION BY HANDICAPPED USER
88  DF  POCKET TYPEWRITER
89  DF  KEY REASSIGNMENT {1}
91  DF  STENOGRAPHIC TYPEWRITER {2}
95  DF  LOGOTYPE TYPEWRITER (E.G., WORD TYPING) {3}
100  DF  PLURAL-KEY-ACTUATED TYPEWRITER (E.G., PERMUTATIVE KEY-BOARD) {2}
103  DF  CODE-PRINTING TYPEWRITER (E.G., FOR PRINTING A PATTERN OR MARK) {4}
109  DF  FOREIGN LANGUAGE OR BRAILLE TYPEWRITER {3}
112  DF  ANNULAR TYPEWRITER (E.G., FOR TYPING AROUND CIRCUMFERENCE OF PLATEN) {3}
116  DF  MUSIC-ROLL OR MUSICAL-NOTATION TYPEWRITER {1}
118.1  DF  TYPING BY HEATED DIE
118.2  DF  TYPING BY OTHER THAN TYPE-FACE OR TYPE-DIE {3}
127  DF  TYPING TO PRODUCE EMBOSSED CHARACTER {2}
135  DF  TYPING TO PRODUCE PIERCED CHARACTER {2}
139  DF  INCLUDING TYPE-SET-ASSEMBLAGE MOUNTED ON CARRIER AND RELATIVELY MOVABLE FOR SELECTION AND FOR IMPACT OF TYPE-FACE {11}
176  DF  HAVING FLUID-PRESSURE POWER DRIVE {4}
184  DF  HAVING TYPEWRITER-CONTROLLED RECIPROCABLE ELECTROMAGNETIC DRIVE FOR PLURAL FUNCTIONS IN SAME TYPEWRITER
185  DF  HAVING POWER-DRIVEN OPERATOR FOR PLURAL FUNCTIONS {2}
188  DF  FOR TYPING ON REVERSE SURFACE OF RECORD-MEDIUM {2}
191  DF  INCLUDING INTERPOSED INKING DEVICE (E.G., RIBBON) FOR RECORD-MEDIUM {15}
251  DF  CASE-SHIFT MECHANISM {14}
279  DF  CONTROL OF PRINT POSITION ALONG PRINT-LINE BY SIGNAL GENERATED BY PROGRAMMED-CONTROL-SYSTEM {2}
283  DF  CARRIAGE OR CARRIAGE-MOVING OR MOVEMENT-REGULATING MECHANISM {11}
359  DF  HAVING TYPEWRITER-CONTROLLED RECIPROCABLE ELECTROMAGNETIC DRIVE FOR TYPE BAR ACTUATION IN SAME TYPEWRITER {4}
365  DF  HAVING ROTATED POWER DRIVE INTERMITTENTLY APPLIED FOR TYPE-BAR ACTUATION {7}
383  DF  TYPE-BAR-ACTION MECHANISM OR TYPE-FACE ON TYPE-BAR OR TYPE-FACE INKER {19}
472  DF  KEY-BOARD OR KEY LEVER-ACTUATING MECHANISM {12}
497  DF  WITH CONTROL OF "CARBON PAPER" FOR TYPING PLURAL SIMULTANEOUS COPIES BY SINGLE IMPRESSION (E.G., ON "MANIFOLD SET") {10}
521  DF  FOR TYPING ON CARD IN CARD HOLDER {11}
545  DF  FOR LINE-SPACING BY INCREMENTAL ROTATION OF PLATEN {15}
578  DF  SHEET OR WEB (E.G., RECORD-MEDIUM FEEDING MECHANISM) {13}
648  DF  PLATEN OR PLATEN-MOVING MECHANISM {5}
663  DF  LOCKING OR INTERLOCKING MECHANISM {7}
679  DF  MEANS AUXILIARY TO TYPEWRITING FUNCTION {12}
719  DF  MISCELLANEOUS
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CROSS-REFERENCE ART COLLECTIONS
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900  DF  CHEMICAL-SYMBOL CHARACTER
901  DF  CONTINUOUSLY ROTATING TYPE-HEAD
902  DF  STEPPING-MOTOR DRIVE FOR WEB FEED
903  DF  STEPPING-MOTOR DRIVE FOR CARRIAGE FEED
904  DF  SUBSCRIPT OR SUPERSCRIPT CHARACTER