US3440224A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyurethane compositions and methods for preparing such
Assignee: NL SPENCER KELLOG Inc
•
Filing: 1966-03-15
•
Granted: 1969-04-22
•
Expires: 1986-03-15
Abstract
No abstract record available.
Inventors
- 👤 Clarence N Impola
- 👤 William J Mckillip
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:30
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10; C08G18/28; C08G18/40; C08G18/48; C08G18/487; C08G18/4875; C08K; C08K5/00; C08K5/04; C08K5/10; C08K5/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3143517A
Cited
US3077464A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-04-21 | 1972-10-21 | 1973-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-21 | 1976-10-21 | 1977-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-21 | 1980-10-21 | 1981-04-22 | $7700.00 | Window Closed / Lapsed |