Patent US2803264A successfully refreshed from Google Patents.
Patent US3103518A successfully refreshed from Google Patents.
Patent US3304652A successfully refreshed from Google Patents.
US3304652A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Model slot type racing car with differential front wheel drive
Assignee: DONOFRIO AND CO
•
Filing: 1966-02-07
•
Granted: 1967-02-21
•
Expires: 1986-02-07
Abstract
No abstract record available.
Inventors
- 👤 William T Donofrio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:09
CPC Classifications
A; A63; A63H; A63H18/00; A63H18/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
235 words
A MODEL RACING CAR OF THE TYPE DESIGNED TO BE GUIDED ALONG A SLOTTED RACEWAY, SAID CAR COMPRISING IN COMBINATION, A GENERALLY HORIZONTALLY EXTENDING FRAME, FRONT AND REAR AXLES MOUNTED BY SAID FRAME, ROAD WHEELS JOURNALED FOR ROTATION ADJACENT THE ENDS OF SAID AXLES, A MOTOR MOUNTED ON SAID FRAME ADJACENT SAID FRONT AXLE WHEREBY THE CENTER OF GRAVITY OF SAID RACING CAR IS TOWARD THE FRONT OF SAID CAR, MEANS OPERATIVELY CONNECTING SAID MOTOR IN DRIVING RELATIONSHIP TO SAID FRONT AXLE, A SLOT GUIDE PIVOTALLY MOUNTED ON SAID FRAME AT A POSITION FORWARD OF SAID FRONT AXLE, AND DIFFERENTIAL MEANS FOR APPLYING POWER ON CURVES TO THE INSIDE ONE OF SAID FRONT ROAD WHEELS, SAID DIFFERENTIAL MEANS COMPRISING A DRIVE MEMBER COUPLED TO AND ROTATABLE WITH SAID DRIVEN FRONT AXLE ADJACENT THE INNER SIDE OF EACH OF SAID FRONT ROAD WHEELS, AND MEANS NORMALLY BIASING EACH OF SAID FRONT ROAD WHEELS INTO FRICTIONAL ENGAGEMENT WITH A RESPECTIVE ONE OF SAID DRIVE MEMBERS, WHEREBY AXIAL FORCES UPON SAID WHEELS CAUSED BY CURVES IN SAID SLOTTED RACEWAY WILL REDUCE THE FRICTIONAL ENGAGEMENT OF THE OUTSIDE ONE OF SAID ROAD WHEELS WITH ITS RESPECTIVE DRIVE MEMBER AND WILL CAUSE POWER TO BE APPLIED TO THE INSIDE ONE OF SAID ROAD WHEELS SUCH THAT RACING CAR DRIVE CONTROL AND RACING CAR ELECTRICAL CONTROL IS SUBSTANTIALLY MAINTAINED UPON LATERAL MOVEMENT OF THE REAR END OF THE MODEL RACING CAR.
Claim 2
Dependent Claim
235 words
A MODEL RACING CAR OF THE TYPE DESIGNED TO BE GUIDED ALONG A SLOTTED RACEWAY, SAID CAR COMPRISING IN COMBINATION, A GENERALLY HORIZONTALLY EXTENDING FRAME, FRONT AND REAR AXLES MOUNTED BY SAID FRAME, ROAD WHEELS JOURNALED FOR ROTATION ADJACENT THE ENDS OF SAID AXLES, A MOTOR MOUNTED ON SAID FRAME ADJACENT SAID FRONT AXLE WHEREBY THE CENTER OF GRAVITY OF SAID RACING CAR IS TOWARD THE FRONT OF SAID CAR, MEANS OPERATIVELY CONNECTING SAID MOTOR IN DRIVING RELATIONSHIP TO SAID FRONT AXLE, A SLOT GUIDE PIVOTALLY MOUNTED ON SAID FRAME AT A POSITION FORWARD OF SAID FRONT AXLE, AND DIFFERENTIAL MEANS FOR APPLYING POWER ON CURVES TO THE INSIDE ONE OF SAID FRONT ROAD WHEELS, SAID DIFFERENTIAL MEANS COMPRISING A DRIVE MEMBER COUPLED TO AND ROTATABLE WITH SAID DRIVEN FRONT AXLE ADJACENT THE INNER SIDE OF EACH OF SAID FRONT ROAD WHEELS, AND MEANS NORMALLY BIASING EACH OF SAID FRONT ROAD WHEELS INTO FRICTIONAL ENGAGEMENT WITH A RESPECTIVE ONE OF SAID DRIVE MEMBERS, WHEREBY AXIAL FORCES UPON SAID WHEELS CAUSED BY CURVES IN SAID SLOTTED RACEWAY WILL REDUCE THE FRICTIONAL ENGAGEMENT OF THE OUTSIDE ONE OF SAID ROAD WHEELS WITH ITS RESPECTIVE DRIVE MEMBER AND WILL CAUSE POWER TO BE APPLIED TO THE INSIDE ONE OF SAID ROAD WHEELS SUCH THAT RACING CAR DRIVE CONTROL AND RACING CAR ELECTRICAL CONTROL IS SUBSTANTIALLY MAINTAINED UPON LATERAL MOVEMENT OF THE REAR END OF THE MODEL RACING CAR.
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) | 1970-02-20 | 1970-08-22 | 1971-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-20 | 1974-08-22 | 1975-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-20 | 1978-08-22 | 1979-02-21 | $7700.00 | Window Closed / Lapsed |