Patent US2451831A successfully refreshed from Google Patents.
US3077971A
Expired / Lapsed
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Case shift interlock for typewriter
Assignee: International Business Machines Corp
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Filing: 1962-03-29
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Granted: 1963-02-19
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Expires: 1982-03-29
Abstract
No abstract record available.
Inventors
- 👤 Leon E Palmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:21
CPC Classifications
B; B41; B41J; B41J29/00; B41J29/54; B41J29/58; B41J29/64
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
163 words
IN A TYPEWRITER HAVING A PRINT HEAD WITH LOWER CASE AND UPPER CASE CHARACTERS FORMED ON DIFFERENT PORTIONS OF ITS SURFACE, FIRST KEY CONTROLLED MEANS FOR MOVING SAID HEAD TO PRESENT EITHER OF SAID SURFACE PORTIONS FOR THE SELECTION OF CHARACTERS, SECOND KEY CONTROLLED MEANS FOR MOVING SAID HEAD WITHIN THE AREA OF EITHER OF SAID PORTIONS PRESENTED TO EFFECT THE SELECTION OF CHARACTERS TO BE PRINTED, SAID FIRST KEY CONTROLLED MEANS INCLUDING A CLUTCH WHICH IS OPERABLE WHEN ENGAGED FOR MOVING SAID PRINT HEAD TO PRESENT A DIFFERENT ONE OF SAID SURFACE PORTIONS IN A SELECTING POSITION, AN ELEMENT OPERABLE WHEN RELEASED FOR EFFECTING ENGAGEMENT OF SAID CLUTCH, A MEMBER NORMALLY HOLDING SAID ELEMENT AND OPERABLE UPON ACTUATION OF SAID FIRST KEY CONTROLLED MEANS FOR RELEASING SAID ELEMENT, A LATCH ENGAGEABLE WITH SAID ELEMENT FOR HOLDING IT AGAINST OPERATION WHEN RELEASED BY SAID MEMBER, AND MEANS ACTIVE DURING OPERATION OF SAID SECOND KEY CONTROLLED MEANS FOR ENGAGING SAID LATCH WITH SAID ELEMENT.
Claim 2
Dependent Claim
163 words
IN A TYPEWRITER HAVING A PRINT HEAD WITH LOWER CASE AND UPPER CASE CHARACTERS FORMED ON DIFFERENT PORTIONS OF ITS SURFACE, FIRST KEY CONTROLLED MEANS FOR MOVING SAID HEAD TO PRESENT EITHER OF SAID SURFACE PORTIONS FOR THE SELECTION OF CHARACTERS, SECOND KEY CONTROLLED MEANS FOR MOVING SAID HEAD WITHIN THE AREA OF EITHER OF SAID PORTIONS PRESENTED TO EFFECT THE SELECTION OF CHARACTERS TO BE PRINTED, SAID FIRST KEY CONTROLLED MEANS INCLUDING A CLUTCH WHICH IS OPERABLE WHEN ENGAGED FOR MOVING SAID PRINT HEAD TO PRESENT A DIFFERENT ONE OF SAID SURFACE PORTIONS IN A SELECTING POSITION, AN ELEMENT OPERABLE WHEN RELEASED FOR EFFECTING ENGAGEMENT OF SAID CLUTCH, A MEMBER NORMALLY HOLDING SAID ELEMENT AND OPERABLE UPON ACTUATION OF SAID FIRST KEY CONTROLLED MEANS FOR RELEASING SAID ELEMENT, A LATCH ENGAGEABLE WITH SAID ELEMENT FOR HOLDING IT AGAINST OPERATION WHEN RELEASED BY SAID MEMBER, AND MEANS ACTIVE DURING OPERATION OF SAID SECOND KEY CONTROLLED MEANS FOR ENGAGING SAID LATCH WITH SAID ELEMENT.
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) | 1966-02-18 | 1966-08-20 | 1967-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-02-18 | 1970-08-20 | 1971-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-02-18 | 1974-08-20 | 1975-02-19 | $7700.00 | Window Closed / Lapsed |