USRE27917E
Expired / Lapsed
US
⏱️ 0.0 years remaining
Open-pore polyurethane product
Assignee: —
•
Filing: 1971-10-01
•
Granted: 1974-02-12
•
Expires: 1991-10-01
Abstract
Abstract AN OPEN-PORE POLYURETHANE STRUCTURE HAVING A POROSITY OF AT LAST 50% AND A DENSITY OF 0.1-0.5 GRAMS PER CUBIC CENTIMETER; AND COMPRISING COHERENT SPHERICAL PARTICLES OF LESS THAN 10 MICRONS DIAMETER SEPARATED BY INTERCONNECTED INTERSTICES USEFUL AS A FILTER AND OIL-ABSORBENT; AND THE METHOD OF PRODUCING SAID STRUCTURE
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:34
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/22; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/48; C08G18/50; C08G18/5021; C08G18/70; C08G18/72; C08G18/74; C08G18/76; C08G18/7657; C08G18/7664; C08G2110/00; C08G2110/0025; C08G2110/0041; C08G2110/0058; C08G2110/0066; C08G2340/00; C08J2375/00; C08J2375/04; Y; Y10; Y10T; Y10T428/00; Y10T428/26; Y10T428/268
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-11 | 1977-08-13 | 1978-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-11 | 1981-08-13 | 1982-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-11 | 1985-08-13 | 1986-02-12 | $7700.00 | Window Closed / Lapsed |