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US3564740A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid novelty device
Assignee: Individual
•
Filing: 1968-06-06
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Granted: 1971-02-23
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Expires: 1988-06-06
Abstract
Abstract A MULTICOMPARTMENT DISPLAY DEVICE WHEREIN FLUIDS OF INDIVIDUALLY DISTINCT SPECIFIC GRAVITIES PRODUCE A DECORATIVE EFFECT BY MOVEMENT OF THE FLUIDS, AND IN WHICH THE GRAVITY FLOW OF ONE FLUID OCCURS SIMULTANEOUSLY WITH THE UPWARD FLOW OF ANOTHER IN A REVERSIBLE MECHANISM THROUGH SYMMETRICAL PORTING ARRANGEMENT THAT REQUIRES NO MECHANICALLY MOVING PARTS.
Inventors
- 👤 Virgil T Calfee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:00
CPC Classifications
G; G09; G09F; G09F13/00; G09F13/24; G09F11/00; G09F11/23
Claims Analysis
Total Claims: 0
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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) | 1974-02-22 | 1974-08-24 | 1975-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-22 | 1978-08-24 | 1979-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-22 | 1982-08-24 | 1983-02-23 | $7700.00 | Window Closed / Lapsed |