Patent US3556190A successfully refreshed from Google Patents.
US3556190A
Expired / Lapsed
US
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C tires
Assignee: Dunlop Co Ltd
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Filing: 1968-04-10
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Granted: 1971-01-19
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Expires: 1988-04-10
Abstract
Abstract A PNEUMATIC TIRE PROVIDED WITH A PLURALITY OF GENERALLY CIRCUMFERENTIALLY-EXTENDING GROOVES ALL OF WHICH ARE NARROW IN WIDTH, AND SOME OF WHICH ARE PROVIDED ALONG THE BASES THEREOF WITH BULBOUS CHANNELS TO INCREASE THE TREAD STABILITY AND REDUCE THE RATE OF TREAD WEAR WITHOUT IMPAIRING THE TREAD DRAINAGE CAPACITY.
Inventors
- 👤 John M Riches
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:48
CPC Classifications
B; B60; B60C; B60C11/00; B60C11/03; B60C11/04; B60C11/042; B60C11/0306; B60C11/0309; Y; Y10; Y10S; Y10S152/00; Y10S152/03
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
116 words
A pneumatic tire having a tread portion comprising generally circumferentially-extending drainage grooves and lateral slots each connecting with a circumferential groove, all the circumferential grooves being of narrow width adjacent to the ground-contacting surface of the tire, the circumferential narrow grooves being of undulating form with the peaks of adjacent undulations being skewed axially of the tire, some of the circumferential grooves being provided with channel portions of substantially increased relative width adjacent to the groove base and at least some of the circumferential grooves being provided with at least one substantially radially extending conduit, of greater transverse width than that of the narrow groove, leading from the tread ground contacting surface into said channel portions.
Claim 2
Dependent Claim
121 words
A pneumatic tire having a tread portion comprising generally circumferentially-extending drainage grooves and transverse narrow slots interconnecting the circumferential grooves, all the circumferential grooves being of narrow width adjacent to the ground-contacting surface of the tire, at least some of the circumferential grooves being provided with channel portions of substantially increased relative width adjacent to the groove base said transverse slots having submerged channel portions leading into the channel portions of the bases of the circumferential grooves to which they are connected, and at least some of the circumferential grooves being provided with at least one substantially radially extending conduit, of greater transverse width than that of the narrow groove, leading from the tread ground contacting surface into said channel portions.
Claim 3
Dependent Claim
54 words
A pneumatic tire according to claim 3 wherein at least some of the transverse slots are provided with at least one substantially radially extending conduit of substantially greater circumferential width than the circumferential width of the transverse slot in which it is disposed, leading from the tread ground contacting surface inTo its channel portion.
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) | 1974-01-18 | 1974-07-20 | 1975-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-18 | 1978-07-20 | 1979-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-18 | 1982-07-20 | 1983-01-19 | $7700.00 | Window Closed / Lapsed |