U.S. patents available from 1976 to present.
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Mark Twain (Samuel L. Clemens) received Patent No. 121,992 for "An Improvement in Adjustable and Detachable Straps for Garments." He later received two more patents: one for a self-pasting scrapbook and one for a game to help players remember important historical dates.

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Class 234/34 - With verifier (data comparator)


Subclass of Class 234 - Selective cutting (e.g., punching)
Definition: Device in which the signal- or impulse-generating means
No. of patents: 2
Last issue date: 06/03/1980


NumberTitleIssue Date
4205769Methods of and system for counting holes and for detecting missing holes in a web
A continuous web or laminate (32) of flexible material is indexed through a punch press (44) whereat holes of different shapes and sizes are punched in repetitive patterns through successive sections of the laminate. The laminate (32) is then moved beneat... 		06/03/1980
4013216Punch check apparatus
In a card punch machine there is provided a photoelectromechanical punch checking system. A shutter is mounted on each punch pin in the card punch machine and movement of each shutter is monitored by a photoelectronic sensor. Signals from the electronic s... 		03/22/1977
 
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