US3581864A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ribbon lock for typewriter spools
Assignee: Individual
•
Filing: 1968-12-23
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Granted: 1971-06-01
•
Expires: 1988-12-23
Abstract
Abstract A typewriter ribbon spooling arrangement comprising two spools joined by an open bridging channel through which the ribbon passes, and which can be broken to enable installation of the spools in a typewriter, wherein integral hinged covers are provided for the channels, which prevent transverse emergence of the ribbon from the channels.
Inventors
- 👤 Walter D Landgraf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:34
CPC Classifications
B; B41; B41J; B41J32/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
132 words
A typewriter ribbon spool and cup arrangement including a pair of cups having a ribbon extending between said cups, a channel for said ribbon extending between said cups and including two sidewalls and a top wall, leaving an open bottom, a closure for said open bottom having a closure wall extending between said sidewalls at the bottom of said channel, said closure being integral with one of the sidewalls and fabricated of the same material as said one of said sidewalls, said closure at said one of said sidewalls being weakened to provide a hinge, said closure at the other of said sidewalls having two parallel legs extending at right angles to said closure wall and separated by a distance arranged and adapted to only frictionally engage said other of said sidewalls.
Claim 2
Dependent Claim
132 words
A typewriter ribbon spool and cup arrangement including a pair of cups having a ribbon extending between said cups, a channel for said ribbon extending between said cups and including two sidewalls and a top wall, leaving an open bottom, a closure for said open bottom having a closure wall extending between said sidewalls at the bottom of said channel, said closure being integral with one of the sidewalls and fabricated of the same material as said one of said sidewalls, said closure at said one of said sidewalls being weakened to provide a hinge, said closure at the other of said sidewalls having two parallel legs extending at right angles to said closure wall and separated by a distance arranged and adapted to only frictionally engage said other of said sidewalls.
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) | 1974-05-31 | 1974-11-30 | 1975-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-31 | 1978-11-30 | 1979-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-31 | 1982-11-30 | 1983-06-01 | $7700.00 | Window Closed / Lapsed |