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US4909738A Expired / Lapsed US ⏱️ 0.0 years remaining

Artificial teeth for anterior teeth portions

Assignee: G-C TOSHI KOGYO Corp NO 285 TORIIMATSUCHO 2-CHOME KASUGAI-SHI AICHI-KEN JAPAN
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Filing: 1989-07-25
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Granted: 1990-03-20
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Expires: 2009-07-25
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Abstract

Abstract An artificial tooth for anterior teeth portions including a concave hollow extending from a basal segment to a lingual incisal segment and located in a substantially central segment, wherein: a percentage of the major diameter of the hollow to the full length is in a range of 10% to 100%, a maximum depth of the hollow is in a range of 0.5 mm to 5.0 mm and a minimum thickness of a cervical segment is in a range of 0.1 mm to 5.0 mm, and a width and length of the cervical segment being defined in terms of a percentage of the cervical minimum mesiodistal length to the maximum mediodistal length being in a range of 50% to 100% and a percentage of the cervical major diameter to the full major diameter being in a range of 10% to 50%.

Inventors

  • 👤 Minoru Ai
  • 👤 Kensuke Yamagata
  • 👤 Tadaki Kagaya
  • 👤 Akira Hasegawa
  • 👤 Yuji Nakamura
  • 👤 Ikuo Ikeda

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-24 03:38
CPC Classifications
A; A61; A61C; A61C13/00; A61C13/08; A61K; A61K6/00; A61K6/80; A61K6/802; A61K6/807; A61K6/809; A61K6/818; A61K6/831; A61K6/838

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 141 words
An artificial tooth for anterior teeth portions including a concave hollow extending from a basal segment to a lingual incisal segment and located in a substantially central segment, wherein: a percentage of the major diameter of said hollow to the full major diameter is in a range of 10% to 100%, a maximum depth of said hollow is in a range of 0.5 mm to 5.0 mm and a minimum thickness of a cervical segment is in a range of 0.1 mm to 5.0 mm, and a width and length of said cervical segment being defined in terms of a percentage of the cervical minimum mesiodistal length to the maximum mesiodistal length being in a range of 50% to 100% and a percentage of the cervical major diameter to the full major diameter being in a range of 10% to 50%.
Claim 2
Dependent Claim 141 words
An artificial tooth for anterior teeth portions including a concave hollow extending from a basal segment to a lingual incisal segment and located in a substantially central segment, wherein: a percentage of the major diameter of said hollow to the full major diameter is in a range of 10% to 100%, a maximum depth of said hollow is in a range of 0.5 mm to 5.0 mm and a minimum thickness of a cervical segment is in a range of 0.1 mm to 5.0 mm, and a width and length of said cervical segment being defined in terms of a percentage of the cervical minimum mesiodistal length to the maximum mesiodistal length being in a range of 50% to 100% and a percentage of the cervical major diameter to the full major diameter being in a range of 10% to 50%.
Claim 3
Dependent Claim 15 words
An artificial tooth as claimed in claim 1, which is formed of a synthetic resin.
Claim 4
Dependent Claim 13 words
An artificial tooth as claimed in claim 1, which is formed of ceramics.
Claim 5
Dependent Claim 21 words
An artificial tooth as claimed in claim 1, which is formed of a composite material of a synthetic resin with ceramics.

References Cited (Backward Citations)

US1172652A Cited
US2310732A Cited
US3052982A Cited
US3488847A Cited
US4645455A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1993-03-19 1993-09-18 1994-03-20 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1997-03-19 1997-09-18 1998-03-20 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2001-03-19 2001-09-18 2002-03-20 $7700.00 Window Closed / Lapsed

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