US3675867A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic tape spool and cartridge
Assignee: Individual
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Filing: 1970-06-12
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Granted: 1972-07-11
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Expires: 1990-06-12
Abstract
Abstract The tape spool in an endless magnetic tape cassette is an integrally one piece molded unit of a polymeric resin and includes a thin circular base, a thin walled coaxial hub including a cylindrical upper section, a lower first conical section extending inwardly from the upper section bottom to the base and a bottom coaxial section extending outwardly from the first conical section medial periphery to the base to delineate a peripheral groove in the hub. A sleeve projects coaxially from the base within the hub and has vertical slots in its lower part connected to radial slots in the base. Radial ridges are formed on the base top face and a circular coaxial ridge in its bottom face proximate the bottom of the first coaxial wall.
Inventors
- 👤 Nathan L Solomon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:07
CPC Classifications
G; G11; G11B; G11B23/00; G11B23/02; G11B23/04; G11B23/06; G11B23/07; B; B65; B65H; B65H75/00; B65H75/02; B65H75/04; B65H75/08; B65H75/12; G11B23/037
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
169 words
In an endless magnetic recording tape cassette the improvement comprising a tape spool located in said cassette and formed as an integral unit of a synthetic organic polymeric resin and including a substantially flat circular base section, a hollow hub section upwardly, coaxially projecting from and integrally formed with and of lesser diameter than said base section and having a peripheral groove formed in the outer face thereof, and a sleeve coaxial with and of smaller diameter than said hub section and integrally formed with and projecting upwardly from said base section, said hub section including an upper cylindrical wall, a lower first conical wall extending radially inwardly from the lower edge of said cylindrical wall to said base section, and a bottom second conical wall integral with and extending from a periphery of said first conical wall intermediate the top and bottom thereof to said base section, the confronting underfaces of said conical walls diverging downwardly to delineate a circular groove in the underface of said base section.
Claim 2
Dependent Claim
169 words
In an endless magnetic recording tape cassette the improvement comprising a tape spool located in said cassette and formed as an integral unit of a synthetic organic polymeric resin and including a substantially flat circular base section, a hollow hub section upwardly, coaxially projecting from and integrally formed with and of lesser diameter than said base section and having a peripheral groove formed in the outer face thereof, and a sleeve coaxial with and of smaller diameter than said hub section and integrally formed with and projecting upwardly from said base section, said hub section including an upper cylindrical wall, a lower first conical wall extending radially inwardly from the lower edge of said cylindrical wall to said base section, and a bottom second conical wall integral with and extending from a periphery of said first conical wall intermediate the top and bottom thereof to said base section, the confronting underfaces of said conical walls diverging downwardly to delineate a circular groove in the underface of said base section.
Claim 3
Dependent Claim
23 words
The spool of claim 1, including a plurality of circumferentially spaced radially extending ridges formed on the top face of said base section.
Claim 4
Dependent Claim
45 words
The spool of claim 1, including a plurality of circumferentially spaced radially extending ridges formed on the top face of said base section and a coaxial circular ridge formed on the underface of said base section proximate the bottom edge of said second conical wall.
Claim 5
Dependent Claim
56 words
The spool of claim 1, wherein said sleeve terminates at a level below the top of said hub and has a plurality of circumferentially spaced vertical slots formed in the lower part thereof and said base section has radial slots formed therein communicating with said vertical slots and terminating short of the wall of said hub.
Claim 6
Dependent Claim
30 words
The spool of claim 1, including a circular ridge coaxially formed on the underface of said base section and of larger inside diameter than the outside diameter of said sleeve.
Claim 7
Dependent Claim
17 words
The spool of claim 1 wherein said peripheral groove top and bottom faces are symmetrical and conical.
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) | 1975-07-11 | 1976-01-10 | 1976-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-11 | 1980-01-10 | 1980-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-11 | 1984-01-10 | 1984-07-11 | $7700.00 | Window Closed / Lapsed |