US4428547A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic recording tape cartridge
Assignee: Maxell Ltd
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Filing: 1982-03-11
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Granted: 1984-01-31
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Expires: 2002-03-11
Abstract
Abstract A magnetic recording tape cartridge comprising a top section and a bottom section assembled together to define a chamber therebetween for containing a pair of tape reels each of which is resiliently supported by a spring plate member, the base portion of which is fixed onto the top section, wherein the improvement comprises a partition wall means for separating at least the base portion of the spring plate member from the chamber.
Inventors
- 👤 Shinichi Gotoh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 02:11
CPC Classifications
G; G11; G11B; G11B23/00; G11B23/02; G11B23/04; G11B23/08; G11B23/087
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
130 words
A magnetic recording tape cartridge comprising a top section and a bottom section, each of the sections having a front wall, a rear wall and side walls, said sections being assembled together to define a tape chamber therebetween for containing a pair of tape reels each of which is rotatably supported with a bottom axis thereof engaged with said bottom section and a top axis thereof engaged with a spring plate member, said spring plate member having a base portion fixed onto said top section and a pair of leg portions extending from said base portion to each of the top axis of said tape reels, wherein the improvement comprising a partition wall means for separating at least said base portion of said spring plate member from said tape chamber.
Claim 2
Dependent Claim
130 words
A magnetic recording tape cartridge comprising a top section and a bottom section, each of the sections having a front wall, a rear wall and side walls, said sections being assembled together to define a tape chamber therebetween for containing a pair of tape reels each of which is rotatably supported with a bottom axis thereof engaged with said bottom section and a top axis thereof engaged with a spring plate member, said spring plate member having a base portion fixed onto said top section and a pair of leg portions extending from said base portion to each of the top axis of said tape reels, wherein the improvement comprising a partition wall means for separating at least said base portion of said spring plate member from said tape chamber.
Claim 3
Dependent Claim
85 words
A magnetic recording tape cartridge according to claim 1 wherein said partition wall means comprises upper wall members formed inside the top section with gaps defined at the position where said leg portion of the spring plate passes, and a lower wall member formed inside said top section having a configuration in plan view generally similar to a plan view of the upper wall member, said lower wall member being provided with projected wall members mating with said gaps formed in the upper wall member.
Claim 4
Dependent Claim
49 words
A magnetic recording tape cartridge according to claim 2 wherein said spring plate member coamprises at least one perforation in the base portion thereof, said top section comprising at least one projection whereby said perforation is engaged with said projection, which is caulked for fixing said spring plate member.
Claim 5
Dependent Claim
25 words
A magnetic recording tape cartridge according to claim 2 wherein said spring plate member has a generally V character configuration made of stainless steel material.
Claim 6
Dependent Claim
56 words
A magnetic recording tape cartridge according to claim 1 wherein said cartridge further comprises a pair of guide wall members projected from the rear wall of the top section, each of said wall members having a slanted surface the bottom of which is engaged with the corresponding edge of the base portion of the spring plate.
Claim 7
Dependent Claim
39 words
A magnetic recording tape cartridge according to claim 5 wherein said slanted surface of each of the guide wall members is further inclined so as to engage with the rear edge of the leg portion of the spring plate.
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) | 1987-01-30 | 1987-08-01 | 1988-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-30 | 1991-08-01 | 1992-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-30 | 1995-08-01 | 1996-01-31 | $7700.00 | Window Closed / Lapsed |