Typewriter with instructional apparatus
Patent 4185400 Issued on January 29, 1980. Estimated Expiration Date: 
August 14, 1998. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
August 14, 1998. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 698114 1862872 3114036 3246402 3494051 3536178 3729081 3840106 3862679 3866736 InventorsAssigneeApplicationNo. 05/933146 filed on 08/14/1978US Classes:434/345, Size or shape of, or aperture in, free element cntrols indication of response correctness235/489, Perforated400/430, Type-bar pulled to print-point400/677, For locking selected group(s) of keys434/167Spelling, phonics, word recognition, or sentence formationExaminersPrimary: Shepperd, John W.Attorney, Agent or FirmInternational ClassG09B 13/00 (20060101)AbstractA typewriter and the like utilized as an instructional aid device has control means for teaching alphabetical letter recognition, the sequence of letters in forming words and the association of a word to the picture of an object. A coded card, the preferred control means, carries the word related to the object, and optionally the picture of the object, and includes a series of perforations related to the word, which perforations are adapted to be penetrated by attachments carried on the key bars only when a key is struck in proper sequence. If an incorrect key is struck the device does not function. Card advancing means are provided to advance the card after each correct key is struck in proper sequence. In the absence of a control card, the typewriter and the like can be operated in a conventional manner. | |
