Classification Case Study

Ok, so I researched an obscure tape measure company based in Bangor, Maine just like any normal person might. I found that they had a handful of patents and a couple trademarks. Of interest here are the two US patents that they also filed in Canada. The texts of the two US patents match almost verbatim with their Canadian counterparts. I thought an examination of their categorizations might be interesting. The Canadian patent office provided classifications under their system and the uspto provided classifications in their system, as well as under the ipc and cpc systems.

The patents were filed by one Charles Crogan, the lead character in the short lived Crogan Manufacturing Company of Bangor, Maine. Crogan filed his US patent 1,216,418 in Canada which was granted as CA-179,403. The text of both are identical after the first sentence. (The Canadian patent start with the second sentence of the US patent.)

CA-179,403 issued: 1917-09-25
Canadian Patent Classification (CPC): 33/154 which is
33 Geometrical instruments/(112) Measuring Or Gauging (151) Tape (153) With Reel or Casing (154) With Viewing Opening

1,216,418 Granted 1917-02-20 with uspto classification 33/765 which in English is:
33 geometrical instruments/(700) distance measuring (755) by flexible tape (761) specified reel housing feature (765) opening in housing for reading tape

The uspto says the IPC's are G01B 3/10 (20060101) and G01B 3/02 (20060101) which in English is
G01B (3/00) Instruments as specified in the subgroups and characterised by the use of mechanical measuring means (arrangements for measuring particular parameters G01B 5/00; devices of general interest specially adapted or mounted for storing and repeatedly paying-out and re-storing lengths of material B65H 75/34) G01B (3/02) Rulers or tapes with scales or marks for direct reading (3/10) flexible

Inexplicably there is no cpc listed on the uspto site for this patent.




A second, later pair is US-1,233,034 Issued 1917-07-10 and CA-186958

CA-186958 Issued 1918-10-15
Canadian Patent Classifications: 33/152 ; 33/155 or
33 Geometrical instruments/(112) Measuring Or Gauging (151) Tape (152) With Free-End Attachments
33 Geometrical instruments/(112) Measuring Or Gauging (151) Tape (153) With Reel or Casing (155) With Braking or Locking Means

Current U.S. Class: 33/768; 242/395.1; 242/405; 33/27.03 or in English:
242/395.1 = 242 winding, tensioning, or guiding/(370) reeling device (389) with particular drive (e.g., ratchet drive, motor drive) (395) manually rotatable crank or wheel (395.1) foldable spool drive crank
242/405 = 242 winding, tensioning, or guiding/(370) reeling device (398) with particular frame or frame carrier (405) hand carried Derived subclasses: (405.1) hand wrapped (405.2) with distinct handle
33/27.03 = 33 geometrical instruments/(18.1) scriber (27.01) curved line (27.02) compass (27.03) beam type
33/768 = 33 geometrical instruments/(700) distance measuring (755) by flexible tape (761) specified reel housing feature (768) including attachment

The uspto lists the current CPC class as G01B 3/1041 (20130101) which is:
G01B /(3/00) Instruments as specified in the subgroups and characterised by the use of mechanical measuring means (arrangements for measuring particular parameters G01B5/00 ; devices of general interest specially adapted or mounted for storing and repeatedly paying-out and re-storing lengths of material B65H75/34)(3/02) Rulers or tapes with scales or marks for direct reading [2013.01] (3/10) {flexible, e.g. tape measures} (3/1041) {Casings, i.e. structures to contain the tape} [2013.01]

The uspto says the IPC's are G01B 3/02 (20060101) and G01B 3/10 (20060101) which are the same as in the earlier US patent above, just in the opposite order.

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