# US 7,607,849 B2 · Letter opening stylus and writing instrument with pocket clip > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,607,849 B2 - Document ID: US7607849B2 - Status: Granted - Kind: B2 - Application number: 12/125,388 - Filed: 2008-05-22 - Published: 2008-09-11 - Granted: 2009-10-27 - Earliest claimed: 2004-12-10 - Inventors: Fred Barker - Web page: https://patentgrep.com/patent/US7607849B2 ## CPC - B43K 24/06: operated by turning means - B43K 24/08: operated by push-buttons - B43K 25/026: {combined with other objects} - B43K 25/028: {combined with means for propelling, projecting or retracting the writing unit} - B43K 27/00: Multiple-point writing implements, e.g. multicolour; Combinations of writing implements (B43K29/00 takes precedence; mechanisms for selecting, projecting, retracting or locking writing units B43K24/00; multiple writing devices with pantographic linkages B43L13/12) - B43K 29/18: with hand tools, e.g. erasing knives (with pocket knives B26B) - B43M 7/002: {Hand tools} - B43M 7/007: {with cutting blades} - G06F 3/03545: {Pens or stylus} - B43K: IMPLEMENTS FOR WRITING OR DRAWING (containers, casings or accessories for cosmetic substances, e.g. shaving soap, lipstick, make-up A45D34/00, A45D40/00) - B43M: BUREAU ACCESSORIES NOT OTHERWISE PROVIDED FOR (stapling devices B25C5/00; devices for temporarily attaching sheets together B42F) - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) ## Abstract An improvement to a writing instrument with stylus, a pocket clip and an integrated letter-opening blade. The improvement consists of locating the letter-opening blade in the pocket clip of the pen. The blade is prevented from cutting the pocket of the user due to a blade protector that is mechanically linked to the mechanism that extends and retracts with the marking or writing tip. In an alternate embodiment, the blade is located on the opposite side of the pocket clip. The extending and retracting mechanism can be a variety of types including twists press, sliding. The stylus provides input to a PDA, touch screen or other tactile input device. Another embodiment includes a letter opener with a stylus. ## Claims ### Claim 1 A writing instrument comprising: an elongated writing instrument having a lower cylindrical portion and an upper cylindrical portion that are rotational linked along their central axis; a pocket clip located on the outside of said upper cylindrical portion; a marking tip having an elongated ink cartridge body wherein said marking tip is extendable and retractable from an end of said lower cylindrical portion when said upper and lower cylindrical portions are rotated in opposite directions, and a letter opening blade that is fixedly secured to said elongated ink cartridge body such that when said marking tip is moved in said elongated writing instrument said letter opening blade moves in unison with said elongated body and said marking tip. ### Claim 2 (depends on 1) The writing instrument of claim 1 wherein said marking tip is selected from one or more of the following items, pencil, pen, marker, and highlighter. ### Claim 3 (depends on 1) The writing instrument of claim 1 wherein said elongated writing instrument has an outer body made from a group of materials consisting of metal, plastic, wood, glass and mineral. ### Claim 4 (depends on 1) The writing instrument from claim 1 wherein said pocket clip is formed from the same material as the pen body. ### Claim 5 (depends on 1) The writing instrument from claim 1 wherein said pocket clip is formed from different material than the pen body. ### Claim 6 (depends on 1) The writing instrument from claim 1 wherein said blade is made from a metal. ### Claim 7 (depends on 1) The writing instrument from claim 1 wherein said pocket clip is “U” shaped. ### Claim 8 (depends on 7) The writing instrument from claim 7 wherein said letter opening blade moves within said “U” shaped pocket clip. ### Claim 9 (depends on 7) The writing instrument from claim 7 wherein at least a portion of said letter opening blade moves from within said “U” shaped pocket clip to outside of said “U” shaped pocket clip. ### Claim 10 (depends on 1) The writing instrument from claim 1 wherein said letter opening blade is replaceable. ### Claim 11 (depends on 1) The writing instrument from claim 1 that further includes a stylus located on an outer end of said upper cylindrical portion. ### Claim 12 (depends on 11) The writing instrument from claim 11 wherein said stylus is spring loaded. ### Claim 13 (depends on 1) The writing instrument from claim 1 wherein said pocket clip is secured to said upper cylindrical portion with an end cap. ### Claim 14 (depends on 1) The writing instrument from claim 1 wherein said elongated ink cartridge body further includes an ink cartridge retainer. ### Claim 15 (depends on 14) The writing instrument from claim 14 wherein said letter opening blade is frictionally secured in said ink cartridge retainer. ### Claim 16 (depends on 1) The writing instrument from claim 1 that further includes a twist barrel that converts rotational twist into linear translation. ### Claim 17 (depends on 16) The writing instrument from claim 16 wherein said marking tip and said elongated ink cartridge body pass through said twist barrel. ### Claim 18 (depends on 1) The writing instrument from claim 1 wherein a letter is opened by passing a closed portion of said letter under said pocket clip when said letter opening blade is extended. ### Claim 19 (depends on 1) The writing instrument from claim 1 that further includes a hollow tapered tip where said marking tip extends through.