Famous Patents
Felix Hoffmann, a German chemist, was searching for something to relieve his father's arthritis. In doing so, he "rediscovered" acetylsalicylic acid and in 1900, patented a stable process for developing it. Hence, we have aspirin.
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| Number | Title | Issue Date |
| 7959368 | Ink cartridge structure for pens An ink cartridge structure includes a resilient device coupled to an ink cartridge for absorbing impact energy acting on the ink cartridge for protection of the ink cartridge. The resilient device includes a connection bar mounted to the ink cartridge and is coupled... | 06/14/2011 |
| 7677824 | Slide pen Disclosed is a slide pen. The slide pen includes (a) a pen core having a nib, (b) a tubular pen core slider having an open lower end, a pen core coupler, and guide ridges formed at an upper portion thereof, so as to allow the nib of the pen core to protrude through ... | 03/16/2010 |
| 7147394 | Writing insert with non-destructive final inspection A writing insert for a writing implement, in particular for a fineliner writing implement. The writing insert includes a writing member with a writing tip, a casing part with a through cavity in which the writing member is at least partially accommodated and from th... | 12/12/2006 |
| 7137751 | Writing instrument with cushioning element A writing instrument having a writing tip that responds to pressure applied during writing through the use of a cushioning element integrally formed with another part of the writing instrument. In a preferred embodiment, a writing instrument comprises a barrel, a ca... | 11/21/2006 |
| 6914596 | Personal digital assistant with retractable stylus A Personal Digital Assistant (PDA) with retractable stylus comprises a retractable stylus, a housing, a stylus slot, and a push portion, wherein a contact pad is attached to the inner side of the push portion. The retractable stylus comprises a pen shaft having a re... | 07/05/2005 |
| 6902334 | Ball-point pen A ball-point pen comprises: a ball-point pen tip, a coil spring, a refill, a mid tube, a upper tube, a clip, a sliding bar, a lower holder, a pen cap, a back plug spring, a sliding bracket, and a back plug; wherein the refill spring is placed inside the ball-point p... | 06/07/2005 |
| 6860667 | Writing instrument with biased rotatable assembly A writing instrument is provided having an elongated shell having a longitudinal axis and an elongated assembly having a writing tip disposed at a first end of the elongated assembly. The elongated assembly is disposed at least partially in the elongated shell. The ... | 03/01/2005 |
| 6428232 | Roller ball pen with adjustable spring tension A roller ball pen (2) that permits a user to adjust the bias force that biases a roller ball cartridge (4) out of the pen (2) to suit the user's particular writing style. The pen (2) has a body (8) having distal and proximal ends, a roller ball cartridge ... | 08/06/2002 |
| 6261015 | Roller ball pen with adjustable spring tension A roller ball pen that permits a user to adjust the bias force that biases a roller ball cartridge out of the pen to suit the user's particular writing style. The pen has a body having distal and proximal ends, a roller ball cartridge disposed in the body... | 07/17/2001 |
| 6135660 | Marking instruments A retractable marking instrument has a seal arrangement for sealing the marking tip (3) when it is retracted within the barrel. The seal arrangement comprises a sealing element (6) shaped as a torus which rolls between the barrel (1) of the instrument and... | 10/24/2000 |
| 5599853 | Erasable inks An aqueous-based erasable ink composition suitable for use in highlighters and other writing instruments includes a styrene-butadiene copolymer and a water-insoluble pigment. It preferably also includes a release agent and an anti-oxidant, and has a visco... | 02/04/1997 |
| 5004362 | Mechanical pencil A mechanical pencil which employs the concept of inverting the configuration of a conventional mechanical pencil by designating the depressible end as the writing end and the stationary end as the eraser and thereby providing the convenience of advancing ... | 04/02/1991 |
| 4696594 | Cosmetic pencil having advanceable cosmetic mass A cosmetic pencil containing a cosmetic mass in a thin pencil lead-like configuration. The pencil has a cosmetic mass or crayon-containing sheath and the cosmetic mass may be metered from the pencil by moving a gripping disk inwardly with respect to the s... | 09/29/1987 |
