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Patent US3404719A successfully refreshed from Google Patents.
US3404719A
Expired / Lapsed
US
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Ballast for pneumatic vehicle tires
Assignee: Sovereign Resources Inc
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Filing: 1966-11-14
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Granted: 1968-10-08
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Expires: 1986-11-14
Abstract
No abstract record available.
Inventors
- 👤 William F Priest
- 👤 Simon Sander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:01
CPC Classifications
B; B60; B60C; B60C5/00; B60C5/004; B60C5/005; Y; Y10; Y10T; Y10T152/00; Y10T152/10; Y10T152/10495
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
58 words
IN A BALLASTED VEHICLE TIRE HAVING AN ANNULAR SEALED CHAMBER INFLATED WITH A GAS UNDER PRESSURE AND A POWDER BALLAST FILLING A MAJOR PORTON OF SAID CHAMBER, THE IMPROVEMENT COMPRISING: SAID BALLAST CONSISTING SUBSTANTIALLY OF PARTICULATE MAGNETIC IRON OXIDE HAVING A SPECIFIC GRAVITY OF FROM 4.1 TO 4.9, SAID OXIDE HAVING A FINENESS OF AT LEAST 325 MESH.
Claim 2
Dependent Claim
58 words
IN A BALLASTED VEHICLE TIRE HAVING AN ANNULAR SEALED CHAMBER INFLATED WITH A GAS UNDER PRESSURE AND A POWDER BALLAST FILLING A MAJOR PORTON OF SAID CHAMBER, THE IMPROVEMENT COMPRISING: SAID BALLAST CONSISTING SUBSTANTIALLY OF PARTICULATE MAGNETIC IRON OXIDE HAVING A SPECIFIC GRAVITY OF FROM 4.1 TO 4.9, SAID OXIDE HAVING A FINENESS OF AT LEAST 325 MESH.
References Cited (Backward Citations)
US3230999A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-10-08 | 1972-04-08 | 1972-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-10-08 | 1976-04-08 | 1976-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-10-08 | 1980-04-08 | 1980-10-08 | $7700.00 | Window Closed / Lapsed |