US4416844A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Deflation-proof pneumatic tire and elastomeric fillings therefore
Assignee: Individual
•
Filing: 1980-12-23
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Granted: 1983-11-22
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Expires: 2000-12-23
Abstract
Abstract A deflation-proof pneumatic tire comprises a casing and a substantially void-free, preferably oil-containing elastomeric filling material. The tire casing is injected with a combination comprising a polyol, an organic polyisocyanate and water, in amounts and under conditions sufficient to produce carbon dioxide and form a polyurea-containing polyurethane elastomer in which the carbon dioxide is dissolved in the elastomer, thereby providing a substantially void-free filling material. The formulation permits the addition of a substantial amount of extender oil while retaining an acceptable level of hardness.
Inventors
- 👤 Ransome J. Wyman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:55
CPC Classifications
B; B29; B29D; B29D30/00; B29D30/04; B60; B60C; B60C1/00; C; C08; C08G; C08G2380/00; Y; Y10; Y10T; Y10T152/00; Y10T152/10; Y10T152/10279; Y10T152/10378; Y10T152/10387; Y10T152/10396; Y10T152/10405
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
94 words
A method for obtaining a deflation-proof tire, comprising: filling a pneumatic tire casing to a pressure of at least 25 psi with a liquid solution prior to significant production of carbon dioxide, said solution comprising, in combination, a polyol, an organic polyisocyanate and water, in amounts sufficient to produce carbon dioxide and form a polyurethane elastomer containing polyurea, said pressure being sufficient to prevent bubble formation in the tire; and curing said elastomer to maintain said carbon dioxide dissolved in said elastomer whereby to produce a substantially void-free elastomeric filling material within said casing.
Claim 2
Independent Claim
94 words
A method for obtaining a deflation-proof tire, comprising: filling a pneumatic tire casing to a pressure of at least 25 psi with a liquid solution prior to significant production of carbon dioxide, said solution comprising, in combination, a polyol, an organic polyisocyanate and water, in amounts sufficient to produce carbon dioxide and form a polyurethane elastomer containing polyurea, said pressure being sufficient to prevent bubble formation in the tire; and curing said elastomer to maintain said carbon dioxide dissolved in said elastomer whereby to produce a substantially void-free elastomeric filling material within said casing.
Claim 3
Dependent Claim
17 words
The method of claim 1 in which said combination additionally comprises at least 10 volume percent oil.
Claim 4
Dependent Claim
24 words
The method of claim 2 in which a major portion of said oil is aromatic, said oil containing a significant amount of polar compounts.
Claim 5
Dependent Claim
20 words
The method of claim 2 in which said polyol is a triol having a molecular weight of at least 3000.
Claim 6
Dependent Claim
12 words
The method of claim 4 in which said polyisocyanate is toluene diisocyanate.
Claim 7
Dependent Claim
12 words
The method of claim 4 in which said polyisocyanate is polymethylene polyphenylisocyanate.
Claim 8
Independent Claim
103 words
A method for obtaining a deflation-proof tire, comprising: filling a pneumatic tire casing with a liquid solution prior to significant production of carbon dioxide, to a predetermined desired tire pressure, said solution comprising, in combination, a polyol, an organic polyisocyanate and water, in amounts sufficient to produce carbon dioxide and form a polyurethane elastomer containing polyurea, said combination additionally comprising an inorganic absorbant for said carbon dioxide, said pressure being sufficient to prevent bubble formation in the tire; and curing said elastomer to maintain said carbon dioxide dissolved in said elastomer whereby to produce a substantially void-free elastomeric filling material within said casing.
Claim 9
Independent Claim
103 words
A method for obtaining a deflation-proof tire, comprising: filling a pneumatic tire casing with a liquid solution prior to significant production of carbon dioxide, to a predetermined desired tire pressure, said solution comprising, in combination, a polyol, an organic polyisocyanate and water, in amounts sufficient to produce carbon dioxide and form a polyurethane elastomer containing polyurea, said combination additionally comprising an inorganic absorbant for said carbon dioxide, said pressure being sufficient to prevent bubble formation in the tire; and curing said elastomer to maintain said carbon dioxide dissolved in said elastomer whereby to produce a substantially void-free elastomeric filling material within said casing.
Claim 10
Dependent Claim
12 words
The method of claim 7 in which said absorbant is calcium hydroxide.
Claim 11
Dependent Claim
18 words
The method of claim 1 in which said combination additionally contains at least 5 weight percent powdered rubber.
Claim 12
Independent Claim
120 words
A method for obtaining a deflation-proof tire comprising: injecting into a pneumatic tire casing a liquid solution comprising in combination a triol having a molecular weight of at least 3000, an organic polyisocyanate, water and substantially aromatic extender oil, in amounts sufficient to produce carbon dioxide and form a polyurea-containing polyurethane elastomer, having a Durometer hardness of at least 20 A; filling said tire casing prior to significant production of carbon dioxide to a pressure of at least 25 psi, said pressure being sufficient to prevent bubble formation in the tire; and curing said elastomer to maintain said carbon dioxide dissolved in said elastomer whereby to produce said polymer-containing urethane elastomer as a substantially void-free filling material within said casing.
Claim 13
Independent Claim
120 words
A method for obtaining a deflation-proof tire comprising: injecting into a pneumatic tire casing a liquid solution comprising in combination a triol having a molecular weight of at least 3000, an organic polyisocyanate, water and substantially aromatic extender oil, in amounts sufficient to produce carbon dioxide and form a polyurea-containing polyurethane elastomer, having a Durometer hardness of at least 20 A; filling said tire casing prior to significant production of carbon dioxide to a pressure of at least 25 psi, said pressure being sufficient to prevent bubble formation in the tire; and curing said elastomer to maintain said carbon dioxide dissolved in said elastomer whereby to produce said polymer-containing urethane elastomer as a substantially void-free filling material within said casing.
Claim 14
Dependent Claim
19 words
The method of claim 10 in which said combination additionally comprises at least 5 weight percent of powdered rubber.
Claim 15
Independent Claim
128 words
A method for obtaining a deflation-proof tire comprising: injecting into a pneumatic tire casing a liquid solution comprising in combination a triol having a molecular weight of at least 3000, an organic polyisocyanate, water and substantially aromatic extender oil, in amounts sufficient to produce carbon dioxide and form a polyurea-containing polyurethane elastomer, having a Durometer hardness of at least 20 A, said combination additionally comprising an inorganic absorbent for said carbon dioxide; filling said tire casing prior to significant production of carbon dioxide to a desired tire pressure, said pressure being sufficient to prevent bubble formation in the tire; and curing said elastomer to maintain said carbon dioxide dissolved in said elastomer whereby to produce said polymer-containing urethane elastomer as a substantially void-free filling material within said casing.
Claim 16
Independent Claim
128 words
A method for obtaining a deflation-proof tire comprising: injecting into a pneumatic tire casing a liquid solution comprising in combination a triol having a molecular weight of at least 3000, an organic polyisocyanate, water and substantially aromatic extender oil, in amounts sufficient to produce carbon dioxide and form a polyurea-containing polyurethane elastomer, having a Durometer hardness of at least 20 A, said combination additionally comprising an inorganic absorbent for said carbon dioxide; filling said tire casing prior to significant production of carbon dioxide to a desired tire pressure, said pressure being sufficient to prevent bubble formation in the tire; and curing said elastomer to maintain said carbon dioxide dissolved in said elastomer whereby to produce said polymer-containing urethane elastomer as a substantially void-free filling material within said casing.
Claim 17
Dependent Claim
15 words
The method of claim 12 in which said absorbent is calcium oxide in calcium hydroxide.
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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) | 1986-11-21 | 1987-05-23 | 1987-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-11-21 | 1991-05-23 | 1991-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-11-21 | 1995-05-23 | 1995-11-22 | $7700.00 | Window Closed / Lapsed |