Did You Know...
...Daniel Webster invented a "bull plow" to pull out tree stumps. It didn't catch on because it was huge and required four oxen to pull it!
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| Number | Title | Issue Date |
| 5068008 | Forming security thread for currency and bank notes A metallized plastic strip containing security indicia is incorporated within currency paper to deter counterfeiting. The plastic strip is made difficult to detect under reflected light by selective pigmentation to match the currency inks. The presence of... | 11/26/1991 |
| 4941687 | Security paper for currency and bank notes A metallized plastic strip containing security indicia is incorporated within currency paper to deter counterfeiting. The plastic strip is made difficult to detect under reflected light by selective pigmentation to match the currency inks. The presence of... | 07/17/1990 |
| 4761205 | Security paper for currency and banknotes Security devices in the form of metalized plastic films are incorporated within a security paper such as banknotes and other valuable documents during the papermaking process for viewing solely by means of transmitted light. The devices comprise printing ... | 08/02/1988 |
| 4552617 | Security features in paper Security features for authentification of currency paper are incorporated within the paper during the paper making process. Various codes are incorporated within the paper for viewing by means of transmitted light. In one embodiment the identifying indici... | 11/12/1985 |
| 4534398 | Security paper This invention relates to a security paper document incorporating counterfeit deterrent, optical variable devices that display their optically active properties in reflectance when there are changes in the angle of incodent light with respect to the eye o... | 08/13/1985 |
