US3420787A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyurethane foams derived from hydroxyalkylated ureas
Assignee: Pharmacia and Upjohn Co
•
Filing: 1966-03-25
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Granted: 1969-01-07
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Expires: 1986-03-25
Abstract
No abstract record available.
Inventors
- 👤 Harold E Reymore Jr
- 👤 James N Tilley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:13
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/48; C08G18/50; C08G18/5075; C08G18/30; C08G18/38; C08G18/3819; C08G18/3823; C08G18/3829; C08G18/3878; C08G18/3889
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2663729A
Cited
US3321415A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-07 | 1972-07-08 | 1973-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-07 | 1976-07-08 | 1977-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-07 | 1980-07-08 | 1981-01-07 | $7700.00 | Window Closed / Lapsed |