Patent US3621603A successfully refreshed from Google Patents.
US3621603A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color changing toy top
Assignee: Mattel Inc
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Filing: 1970-12-08
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Granted: 1971-11-23
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Expires: 1990-12-08
Abstract
Abstract A TOY TOP HAVING A HOUSING WITH A GYROSCOPIC-TYPE ROTOR MOUNTED ON A FREELY ROTATABLE SHAFT THAT EXTENDS BELOW THE HOUSING AND TERMINATES AT A SPINNING TIP WHICH SUPPORTS THE TOP IN SPINNING ENGAGEMENT WITH A PLAYING SURFACE, THE TOP INCLUDES A COLOR DISC ROTATING WITH THE TOP''S ROTOR AND A SUBSTANTIALLY FREELY ROTATABLE COAXIALLY DISPOSED APERTURED OOPAQUE DISC POSITIONED BETWEEN THE COLOR DISC AND A TRANSPARENT PORTION OF THE TOP''S HOUSING SO THAT THE APERTURED DISC MAY ROTATE AT A SPEED DIFFERENT FROM THAT OF THE COLOR DISC TO PROVIDE THE ILLUSION, THAT THE COLOR DISC IS CHANGING COLORS.
Inventors
- 👤 Jacob De Gelder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:31
CPC Classifications
A; A63; A63H; A63H1/00; A63H1/22
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) | 1974-11-22 | 1975-05-24 | 1975-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-22 | 1979-05-24 | 1979-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-22 | 1983-05-24 | 1983-11-23 | $7700.00 | Window Closed / Lapsed |