Patent US3878639A successfully refreshed from Google Patents.
Patent US4029846A successfully refreshed from Google Patents.
US4029846A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fiberboard shims and method of making them
Assignee: Eagle Picher Industries Inc
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Filing: 1975-05-20
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Granted: 1977-06-14
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Expires: 1995-05-20
Abstract
Abstract Shims having improved torque retention, tensile strength, resistance to deformation, and low water absorption are formed from a resin-impregnated, cellulosic fiberboard, soaked in a solution of about 1 to about 20% by volume of methylene-bis-(4-phenyl isocyanate), and cured.
Inventors
- 👤 John W. Decker
- 👤 Mieczyslaw Talik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:37
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08K; C08K5/00; C08K5/16; C08K5/29; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31551; Y10T428/31591; Y10T428/31594; Y10T428/31971; Y10T428/31993; Y10T428/4935; Y10T428/662
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
75 words
In a method of making automotive assembly shims for use in the assembly of imperfectly fitting automotive components, said method comprising; forming the shims from a phenolic resin impregnated cellulosic fiberboard, the improvement comprising: 1. soaking said shims in a solution consisting of about 1 percent to about 20 percent by volume of methylene-bis(4-phenyl isocyanate), 2. and thereafter curing the isocyanate-soaked shims, thereby causing the isocyanate to react with the cellulose fiber in said shims.
Claim 2
Dependent Claim
75 words
In a method of making automotive assembly shims for use in the assembly of imperfectly fitting automotive components, said method comprising; forming the shims from a phenolic resin impregnated cellulosic fiberboard, the improvement comprising: 1. soaking said shims in a solution consisting of about 1 percent to about 20 percent by volume of methylene-bis(4-phenyl isocyanate), 2. and thereafter curing the isocyanate-soaked shims, thereby causing the isocyanate to react with the cellulose fiber in said shims.
Claim 3
Dependent Claim
19 words
The method of claim 1 wherein said solution has a concentration of from about 12 to 20%, by volume.
Claim 4
Dependent Claim
26 words
The method of claim 1 wherein said shims are cured in a furnace at a time-temperature cycle equivalent to about 10° F for about 10 minutes.
Claim 5
Dependent Claim
57 words
In an article of manufacture comprising an automotive assembly shim for use in the assembly of imperfectly fitting automotive components, wherein said shims are formed of a phenolic resin impregnated cellulosic fiberboard, the improvement wherein said shims are further impregnated with a solution consisting of up to about 20 percent by volume of methylene-bis-(4-phenyl isocyanate), and cured.
Claim 6
Dependent Claim
57 words
In an article of manufacture comprising an automotive assembly shim for use in the assembly of imperfectly fitting automotive components, wherein said shims are formed of a phenolic resin impregnated cellulosic fiberboard, the improvement wherein said shims are further impregnated with a solution consisting of up to about 20 percent by volume of methylene-bis-(4-phenyl isocyanate), and cured.
References Cited (Backward Citations)
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Cited
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Cited
US3248254A
Cited
GB1031909A
Cited
FR1460423A
Cited
US3539386A
Cited
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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) | 1980-06-13 | 1980-12-13 | 1981-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-13 | 1984-12-13 | 1985-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-13 | 1988-12-13 | 1989-06-14 | $7700.00 | Window Closed / Lapsed |