US4200679A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Micro-bits of expanded flexible polyurethanes
Assignee: Individual
•
Filing: 1977-09-15
•
Granted: 1980-04-29
•
Expires: 1997-09-15
Abstract
Abstract A polyurethane structure prepared by the comminution of a flexible polyurethane foam in the presence of a compatible protective cooling fluid.
Inventors
- 👤 Max Klein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:45
CPC Classifications
B; B29; B29B; B29B17/00; B29B17/04; B29B17/0404; B01; B01D; B01D39/00; B01D39/14; B01D39/16; B01D39/1669; B01D39/1676; C; C02; C02F; C02F1/00; C02F1/28; C02F1/285; C08; C08J; C08J3/00; C08J3/12; D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/46; D21H17/54; D21H17/57; B29K; B29K2105/00; B29K2105/04; C08J2375/00; C08J2375/04; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/62; Y10; Y10S; Y10S521/00; Y10S521/918; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2998
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
91 words
Polyurethane micro-bits prepared from a flexible polyurethane foam and comprising, as best seen under magnification: (a) broken and inter-connected strand portions from adjacent cells of said flexible foam; (b) said broken and interconnected strand portions being tripodal particles with generally uneven length legs; (c) said strand portions having hook-like projections, indentations and flutes extending therefrom, said hook-like projections, indentations and flutes having been formed by the destruction of the cell windows of said flexible foam; and (d) said strand portions being characterized by a substantially total absence of intact cell windows.
Claim 2
Dependent Claim
91 words
Polyurethane micro-bits prepared from a flexible polyurethane foam and comprising, as best seen under magnification: (a) broken and inter-connected strand portions from adjacent cells of said flexible foam; (b) said broken and interconnected strand portions being tripodal particles with generally uneven length legs; (c) said strand portions having hook-like projections, indentations and flutes extending therefrom, said hook-like projections, indentations and flutes having been formed by the destruction of the cell windows of said flexible foam; and (d) said strand portions being characterized by a substantially total absence of intact cell windows.
Claim 3
Dependent Claim
25 words
Polyurethane micro-bits of claim 1, wherein said micro-bit is prepared from a flexible polyurethane foam having a density less than 6.0 pounds per cubic foot.
Claim 4
Dependent Claim
29 words
Polyurethane micro-bits of claim 1, wherein said micro-bit is prepared from a flexible polyurethane foam having a density from about 1.0 pound to about 3.0 pounds per cubic foot.
Claim 5
Dependent Claim
25 words
An aqueous slurry of the micro-bits of claim 1 wherein said slurry contains from about 1.0 to about 2.0 percent by weight of said micro-bits.
Claim 6
Dependent Claim
25 words
An aqueous slurry of the micro-bits of claim 2 wherein said slurry contains from about 1.0 to about 2.0 percent by weight of said micro-bits.
Claim 7
Dependent Claim
25 words
An aqueous slurry of the micro-bits of claim 3 wherein said slurry contains from about 1.0 to about 2.0 percent by weight of said micro-bits.
References Cited (Backward Citations)
US2983692A
Cited
US3255127A
Cited
US3371053A
Cited
US3472801A
Cited
US3607999A
Cited
US3630820A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-04-29 | 1983-10-29 | 1984-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-04-29 | 1987-10-29 | 1988-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-04-29 | 1991-10-29 | 1992-04-29 | $7700.00 | Window Closed / Lapsed |