Patent US4791503A successfully refreshed from Google Patents.
US4791503A
Expired / Lapsed
US
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Magnetic tape cartridge made from heat resistant resinous material
Assignee: Maxell Ltd
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Filing: 1986-12-24
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Granted: 1988-12-13
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Expires: 2006-12-24
Abstract
Abstract A magnetic tape cartridge comprising a main case made of a resinous material selected from a copolymer comprising repeating units derived from a nitrogen-containing heterocyclic compound and a blend containing a homo- or co-polymer comprising repeating units derived from a nitrogen-containing heterocyclic compound, which has good heat resistance and suffers from less deformation at a high temperature. The content of the nitrogen-containing compound in the copolymer or blend is from 5 to 30% by weight.
Inventors
- 👤 Yoshinori Yamamoto
- 👤 Muneyoshi Ochi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:34
CPC Classifications
G; G11; G11B; G11B23/00; G11B23/02; G11B23/04; G11B23/08; G11B23/087; G11B23/08707; G11B23/08785; C; C08; C08L; C08L25/00; C08L25/02; C08L25/04; C08L25/06; C08L35/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
62 words
A magnetic tape cartridge which comprises a main case made of a resinous material selected from a copolymer comprising repeating units derived from a nitrogen-containing heterocyclic compound and a blend containing a homo- or co-polymer comprising repeating units derived from a nitrogen-containing heterocyclic compound wherein content of the nitrogen-containing compound in the copolymer or blend is from 5 to 30% by weight.
Claim 2
Dependent Claim
62 words
A magnetic tape cartridge which comprises a main case made of a resinous material selected from a copolymer comprising repeating units derived from a nitrogen-containing heterocyclic compound and a blend containing a homo- or co-polymer comprising repeating units derived from a nitrogen-containing heterocyclic compound wherein content of the nitrogen-containing compound in the copolymer or blend is from 5 to 30% by weight.
Claim 3
Dependent Claim
22 words
The magnetic tape cartridge according to claim 1, wherein said resinous material is a copolymer of said nitrogen-containing heterocyclic compound with styrene.
Claim 4
Dependent Claim
25 words
The magnetic tape cartridge according to claim 1, wherein said resinous material is a copolymer of said nitrogen-containing heterocyclic compound with acrylonitrile, butadiene and styrene.
Claim 5
Dependent Claim
28 words
The magnetic tape cartridge according to claim 1, wherein said resinous material is a blend of a homopolymer of said nitrogen-containing heterocyclic compound with polystyrene or acrylonitrile/butadiene/styrene resin.
Claim 6
Dependent Claim
28 words
The magnetic tape cartridge according to claim 1, wherein said resinous material is a blend of a copolymer of said nitrogen-containing heterocyclic compound with polystyrene or acrylonitrie/butadiene/styrene resin.
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) | 1991-12-13 | 1992-06-13 | 1992-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-12-13 | 1996-06-13 | 1996-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-12-13 | 2000-06-13 | 2000-12-13 | $7700.00 | Window Closed / Lapsed |