US3913654A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pneumatic tires
Assignee: Dunlop Holdings Ltd
•
Filing: 1971-06-07
•
Granted: 1975-10-21
•
Expires: 1991-06-07
Abstract
Abstract A pneumatic tire having recesses in its internal surface in those regions which come into contact when the tire is run deflated under load. A lubricating material can be held in the recesses to lubricate the surfaces when they come into contact, of which the following is a specification.
Inventors
- 👤 Tom French
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:36
CPC Classifications
B; B60; B60C; B60C13/00; B60C17/00; B60C17/04; B60C17/047; B60C17/048; B60C17/10; B60C13/02; B60C2013/026
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
155 words
A pneumatic tire and wheel assembly capable of being run in a deflated condition comprising: a. a wheel rim having a pair of annular flanges; b. a pneumatic tire mounted on the wheel to define an inflation chamber and having a tread portion with a width greater than the width of the wheel rim measured between the flanges; c. means to prevent the tire from becoming dislodged from the wheel rim when running deflated; d. the entire interior surface of the tire and the inflation chamber being free of intermediate supporting structure so that when the assembly is run deflated, opposed internal surfaces of the tire come into contact; e. a plurality of lubricant retaining portions recessed into said internal surface in at least one localized region thereof in which a lubricant material can be held so that opposed internal surfaces when brought into contact can be lubricated during rotation of the tire under load.
Claim 2
Dependent Claim
155 words
A pneumatic tire and wheel assembly capable of being run in a deflated condition comprising: a. a wheel rim having a pair of annular flanges; b. a pneumatic tire mounted on the wheel to define an inflation chamber and having a tread portion with a width greater than the width of the wheel rim measured between the flanges; c. means to prevent the tire from becoming dislodged from the wheel rim when running deflated; d. the entire interior surface of the tire and the inflation chamber being free of intermediate supporting structure so that when the assembly is run deflated, opposed internal surfaces of the tire come into contact; e. a plurality of lubricant retaining portions recessed into said internal surface in at least one localized region thereof in which a lubricant material can be held so that opposed internal surfaces when brought into contact can be lubricated during rotation of the tire under load.
Claim 3
Dependent Claim
29 words
A pneumatic tire according to claim 1 in which recessed portions are provided in the interior surfaces of the tire close to but radially inwardly of the tread edge.
Claim 4
Dependent Claim
20 words
A pneumatic tire and wheel assembly according to claim 1 having an aspect ratio of between 30 and 75 percent.
Claim 5
Dependent Claim
20 words
A pneumatic tire and wheel assembly according to claim 3 having an aspect ratio of between 55 and 70 percent.
Claim 6
Dependent Claim
40 words
A pneumatic tire and wheel assembly according to claim 1 in which the recessed portions are formed in both of the said opposed internal surfaces so that both of two opposed surfaces brought into contact are provided with recessed portions.
Claim 7
Dependent Claim
37 words
A pneumatic tire and wheel assembly according to claim 1 in which recessed portions are provided in the interior surfaces of the tire close to but radially outwardly of the rim flange contacting region of the tire.
Claim 8
Dependent Claim
28 words
A pneumatic tire and wheel assembly according to claim 1 in which the recessed portions comprise spaces formed between smoothly rounded humps moulded onto the said internal surface.
Claim 9
Dependent Claim
23 words
A pneumatic tire and wheel assembly according to claim 1 in which the recessed portions comprise spaces formed between a network of ribs.
Claim 10
Dependent Claim
60 words
A pneumatic tire and wheel assembly according to claim 1 in which the recessed portions each comprise one of a plurality of pores formed within the internal surface of the tire, the pores communicating with the said surface to supply lubricating material from the pores to the surface, in particular when two surfaces are brought into contact under substantial pressure.
Claim 11
Dependent Claim
28 words
A pneumatic tire and wheel assembly according to claim 1 in which the recessed portions comprise a network of grooves formed in the internal surface of the tire.
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) | 1978-10-20 | 1979-04-21 | 1979-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-20 | 1983-04-21 | 1983-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-20 | 1987-04-21 | 1987-10-21 | $7700.00 | Window Closed / Lapsed |