US3135153A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Keyboard action assemblies
Assignee: Individual
•
Filing: 1961-11-27
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Granted: 1964-06-02
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Expires: 1981-11-27
Abstract
No abstract record available.
Inventors
- 👤 Duca Thomas S Lo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:55
CPC Classifications
G; G10; G10C; G10C3/00; G10C3/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
256 words
A DEVICE OF THE CLASS DESCRIBED COMPRISING A CHASSIS OF INVERTED CHANNEL FORM INCLUDING FRONT AND REAR FLANGES AND A WEB CONNECTING SAID FLANGES AND EXTENDING FROM SAID FRONT FLANGE TO AT LEAST SAID REAR FLANGE, SAID WEB BEING FORMED WITH A RAISED RIDGE EXTENDING LONGITUDINALLY OF SAID WEB IN THE REGION OF SAID REAR FLANGE, SAID RIDGE BEING FORMED WITH A SERIES OF TRANSVERSELY EXTENDING SPACED AND PARALLEL SLOTS THERETHROUGH, SAID RIDGE BETWEEN SAID SLOTS BEING FORMED WITH A PLURALITY OF DOWNWARDLY STRUCK LOOPS, SAID LOOPS BEING AXIALLY ALIGNED, A PIVOT ROD SEATED IN SAID LOOPS AND EXTENDING THE LENGTH OF SAID RIDGE ACROSS SAID SLOTS, A PLURALITY OF KEY BARS, EACH KEY BAR HAVING FRONT AND REAR ENDS, A KEY CARRIED BY EACH FRONT END, EACH REAR END BEING FORMED WITH A PAIR OF DEPENDING LOBAL PORTIONS IN SLIGHTLY SPACED RELATION TO PROVIDE A DOWNWARDLY OPENING SLOT THEREBETWEEN, EACH PAIR OF LOBAL PORTIONS PROVIDING A FUNNEL-SHAPED OPENING FOR ITS SLOT, SAID LOBAL PORTIONS OF SAID KEY BARS EXTENDING AT LEAST PARTIALLY THROUGH SEPARATE SLOTS IN SAID RIDGE WHEREBY SAID FUNNEL SHAPED MOUTHS OF SAID SLOTS GUIDE SAID PIVOT ROD INTO SAID SLOTS TO PROVIDE A SINGLE PIVOTAL MOUNT FOR ALL OF SAID KEY BARS, A SPRING FOR RETAINING EACH KEY BAR ON SAID PIVOT ROD, MEANS CONNECTING EACH SPRING TO ITS KEY BAR REARWARDLY OF SAID LOBAL PORTIONS, MEANS CONNECTING EACH SPRING TO SAID CHASSIS REARWARDLY OF SAID RIDGE, AND AT LEAST ONE OF SAID CONNECTIONS FOR SAID SPRING BEING A READILY DETACHABLE CONNECTION.
Claim 2
Independent Claim
256 words
A DEVICE OF THE CLASS DESCRIBED COMPRISING A CHASSIS OF INVERTED CHANNEL FORM INCLUDING FRONT AND REAR FLANGES AND A WEB CONNECTING SAID FLANGES AND EXTENDING FROM SAID FRONT FLANGE TO AT LEAST SAID REAR FLANGE, SAID WEB BEING FORMED WITH A RAISED RIDGE EXTENDING LONGITUDINALLY OF SAID WEB IN THE REGION OF SAID REAR FLANGE, SAID RIDGE BEING FORMED WITH A SERIES OF TRANSVERSELY EXTENDING SPACED AND PARALLEL SLOTS THERETHROUGH, SAID RIDGE BETWEEN SAID SLOTS BEING FORMED WITH A PLURALITY OF DOWNWARDLY STRUCK LOOPS, SAID LOOPS BEING AXIALLY ALIGNED, A PIVOT ROD SEATED IN SAID LOOPS AND EXTENDING THE LENGTH OF SAID RIDGE ACROSS SAID SLOTS, A PLURALITY OF KEY BARS, EACH KEY BAR HAVING FRONT AND REAR ENDS, A KEY CARRIED BY EACH FRONT END, EACH REAR END BEING FORMED WITH A PAIR OF DEPENDING LOBAL PORTIONS IN SLIGHTLY SPACED RELATION TO PROVIDE A DOWNWARDLY OPENING SLOT THEREBETWEEN, EACH PAIR OF LOBAL PORTIONS PROVIDING A FUNNEL-SHAPED OPENING FOR ITS SLOT, SAID LOBAL PORTIONS OF SAID KEY BARS EXTENDING AT LEAST PARTIALLY THROUGH SEPARATE SLOTS IN SAID RIDGE WHEREBY SAID FUNNEL SHAPED MOUTHS OF SAID SLOTS GUIDE SAID PIVOT ROD INTO SAID SLOTS TO PROVIDE A SINGLE PIVOTAL MOUNT FOR ALL OF SAID KEY BARS, A SPRING FOR RETAINING EACH KEY BAR ON SAID PIVOT ROD, MEANS CONNECTING EACH SPRING TO ITS KEY BAR REARWARDLY OF SAID LOBAL PORTIONS, MEANS CONNECTING EACH SPRING TO SAID CHASSIS REARWARDLY OF SAID RIDGE, AND AT LEAST ONE OF SAID CONNECTIONS FOR SAID SPRING BEING A READILY DETACHABLE CONNECTION.
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) | 1967-06-02 | 1967-12-02 | 1968-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-02 | 1971-12-02 | 1972-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-02 | 1975-12-02 | 1976-06-02 | $7700.00 | Window Closed / Lapsed |