Patent US4706149A successfully refreshed from Google Patents.
US4706149A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tape cassette
Assignee: Sony Corp
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Filing: 1985-09-10
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Granted: 1987-11-10
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Expires: 2005-09-10
Abstract
Abstract In a tape cassette, which comprises a cassette casing which consists of upper and lower halves which are molded by injection molding from a synthetic resin, reels mounted for rotation in the cassette casing and having at least lower flanges, and a groove formed in an outer surface of a bottom wall of the lower half in a region which is adjacent the lower flanges of the reels, an improvement comprises at least a projection being formed on at least a portion of an inner surface of the bottom wall of the lower half which overlies the guide groove so as to facilitate a flow of a molten resin injection near the guide groove during molding of the lower half.
Inventors
- 👤 Tetsuo Machida
- 👤 Kazuo Ozawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:05
CPC Classifications
G; G11; G11B; G11B23/00; G11B23/02; G11B23/04; G11B23/08; G11B23/087; G11B23/08707; G11B23/08785; B; B29; B29C; B29C45/00; B29C45/17; B29C45/26
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
228 words
In a tape cassette comprising a cassette casing having upper and lower halves molded by injection molding from a synthetic resin, two reels which are mounted for rotation in said cassette casing and have at least lower flanges, and a groove, which is provided in an outer surface of a bottom wall of said lower half of the casing with at least a part of said groove being present in a region of the bottom wall of said lower half that is adjacent each of said lower flanges of said two reels, the improvement comprising at least a first projection being formed on at least a portion of an inner surface of the bottom wall of said lower half to overlie at least a part of said groove and each of said two reels having at least a second projection being formed near an outer periphery of its lower flange, said second projection of each reel moving in a separate circular path during rotation of the reels, said first projection being subdivided into two longitudinally extending portions with one portion for each reel and each portion having a position and length to be received in the circular path of the second projection of a respective reel, said portion of the first projection facilitating flow of a molten resin injection near said groove during molding of the lower half.
Claim 2
Dependent Claim
228 words
In a tape cassette comprising a cassette casing having upper and lower halves molded by injection molding from a synthetic resin, two reels which are mounted for rotation in said cassette casing and have at least lower flanges, and a groove, which is provided in an outer surface of a bottom wall of said lower half of the casing with at least a part of said groove being present in a region of the bottom wall of said lower half that is adjacent each of said lower flanges of said two reels, the improvement comprising at least a first projection being formed on at least a portion of an inner surface of the bottom wall of said lower half to overlie at least a part of said groove and each of said two reels having at least a second projection being formed near an outer periphery of its lower flange, said second projection of each reel moving in a separate circular path during rotation of the reels, said first projection being subdivided into two longitudinally extending portions with one portion for each reel and each portion having a position and length to be received in the circular path of the second projection of a respective reel, said portion of the first projection facilitating flow of a molten resin injection near said groove during molding of the lower half.
Claim 3
Dependent Claim
28 words
In a tape cassette according to claim 1, wherein said second projection is formed with a ring shape along the outer periphery of each of said lower flanges.
Claim 4
Dependent Claim
20 words
In a tape cassette according to claim 1, wherein each portion of said first projection has a flat upper surface.
Claim 5
Dependent Claim
23 words
In a tape cassette according to claim 3, wherein each flat upper surface extends parallel to the inner surface of the bottom wall.
Claim 6
Dependent Claim
26 words
In a tape cassette according to claim 3, wherein each flat upper surface is inclined at an angle to the inner surface of the bottom wall.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-11-09 | 1991-05-11 | 1991-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-11-09 | 1995-05-11 | 1995-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-11-09 | 1999-05-11 | 1999-11-10 | $7700.00 | Window Closed / Lapsed |