Patent US4137112A successfully refreshed from Google Patents.
US4137112A
Expired / Lapsed
US
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Method of retreading a pneumatic tire
Assignee: Hercules Tire and Rubber Co
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Filing: 1977-07-22
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Granted: 1979-01-30
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Expires: 1997-07-22
Abstract
Abstract A method of retreading a pneumatic tire. The tire casing is buffed to a predetermined profile to remove the old tread. A cushion layer having an integral belt disposed therein is wrapped circumferentially around the casing and attached thereto. A precured tread having an integral belt disposed therein is wrapped circumferentially over the cushion and attached to the casing and cushion. The tire is cured to form a unitary structure.
Inventors
- 👤 John A. Hedlund
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:14
CPC Classifications
B; B29; B29D; B29D30/00; B29D30/06; B29D30/52; B29D30/54; B29D30/56
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
150 words
A method of retreading a tire by mounting a new tread on a pneumatic tire casing, said casing having been buffed to a predetermined profile, comprising the steps of: providing a precured tread having an integral belt, said belt comprising a plurality of strands disposed in a preselected orientation with respect to the tread, providing an uncured cushion gum layer having an integral belt, said belt comprising a plurality of strands disposed in a preselected orientation with respect to said layer, wrapping said cushion gum layer around and securing said layer to said casing so that the strands in said layer are situated in a first orientation with respect to said casing, wrapping said tread around and securing said tread to said casing over said cushion gum layer, so that the strands in said tread are situated in a second orientation different from said first orientation; and curing the tire.
Claim 2
Independent Claim
150 words
A method of retreading a tire by mounting a new tread on a pneumatic tire casing, said casing having been buffed to a predetermined profile, comprising the steps of: providing a precured tread having an integral belt, said belt comprising a plurality of strands disposed in a preselected orientation with respect to the tread, providing an uncured cushion gum layer having an integral belt, said belt comprising a plurality of strands disposed in a preselected orientation with respect to said layer, wrapping said cushion gum layer around and securing said layer to said casing so that the strands in said layer are situated in a first orientation with respect to said casing, wrapping said tread around and securing said tread to said casing over said cushion gum layer, so that the strands in said tread are situated in a second orientation different from said first orientation; and curing the tire.
Claim 3
Dependent Claim
26 words
A method as set forth in claim 1 wherein neither said first orientation nor said second orientation extend circumferentially around the tire casing or perpendicular thereto.
Claim 4
Dependent Claim
28 words
A method as set forth in claim 2 wherein said tread is provided with two parallel butt ends, said butt ends being parallel to the strands contained therein.
Claim 5
Dependent Claim
27 words
A method as set forth in claim 2 wherein said layer is provided with two butt ends, said butt ends being parallel to the strands contained therein.
Claim 6
Dependent Claim
48 words
A method as defined in claim 3 further comprising the steps of coating both butt ends with a layer of cement prior to wrapping said tread around said casing, and of applying a layer of uncured rubber between said butt ends after said tread has been so wrapped.
Claim 7
Dependent Claim
21 words
A method as recited in claim 1 wherein said layer-securing step includes a step of cementing the layer to the casing.
Claim 8
Dependent Claim
21 words
A method as recited in claim 1 wherein said layer-securing step includes a step of stitching said layer to said casing.
Claim 9
Dependent Claim
24 words
A method as recited in claim 1 wherein said tread-securing step includes a step of stitching said tread to said layer and said casing.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-01-29 | 1982-07-31 | 1983-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-29 | 1986-07-31 | 1987-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-29 | 1990-07-31 | 1991-01-30 | $7700.00 | Window Closed / Lapsed |