US3747734A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Error correction device
Assignee: Individual
•
Filing: 1971-12-17
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Granted: 1973-07-24
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Expires: 1991-12-17
Abstract
Abstract A mechanism for use in a typewriter to aid a typist in correcting errors on the original typewritten page while it is being typed. A ribbon containing error correction material is supported by slidable means between a ribbon supply spool and a ribbon take-up spool. When actuated by a typist, a pivotable means moves the slidable means and correction ribbon into position for transferring the error correction material from the ribbon over the typed error.
Inventors
- 👤 R Norman
- 👤 J Shelton
- 👤 J Hagood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:52
CPC Classifications
B; B41; B41J; B41J29/00; B41J29/26; B41J29/36
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
166 words
An error correction device for use in typewriters to correct typed errors comprising: a ribbon having one end connected to a supply spool and the opposite end connected to a take-up ribbon spool; said ribbon having error correction material thereon; slidable means for holding said ribbon; means for moving said slidable means into and out of an error correcting position, said take-up ribbon spool having a ratchet secured thereto for operation by said moving means to advance said take-up ribbon spool; platforms for supporting said supply spool and said takeup ribbon spool, and a pawl connected with one of said platforms and disposed for engaging and moving said ratchet, said moving means including an arm pivotally connected to said slidable means for movement thereof, said pawl connected platform having means thereon for pivotally supporting said arm and an actuating follower pivotally attached to said arm for moving said pawl in response to movement of said arm to actuate said ratchet and advance said take-up ribbon spool.
Claim 2
Dependent Claim
166 words
An error correction device for use in typewriters to correct typed errors comprising: a ribbon having one end connected to a supply spool and the opposite end connected to a take-up ribbon spool; said ribbon having error correction material thereon; slidable means for holding said ribbon; means for moving said slidable means into and out of an error correcting position, said take-up ribbon spool having a ratchet secured thereto for operation by said moving means to advance said take-up ribbon spool; platforms for supporting said supply spool and said takeup ribbon spool, and a pawl connected with one of said platforms and disposed for engaging and moving said ratchet, said moving means including an arm pivotally connected to said slidable means for movement thereof, said pawl connected platform having means thereon for pivotally supporting said arm and an actuating follower pivotally attached to said arm for moving said pawl in response to movement of said arm to actuate said ratchet and advance said take-up ribbon spool.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-23 | 1977-01-22 | 1977-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-23 | 1981-01-22 | 1981-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-23 | 1985-01-22 | 1985-07-24 | $7700.00 | Window Closed / Lapsed |