Patent US3450648A successfully refreshed from Google Patents.
US3450648A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of producing cellular polyurethanes employing tertiary amines and certain organic metallic compounds as catalyst system
Assignee: Bayer AG
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Filing: 1967-11-13
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Granted: 1969-06-17
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Expires: 1987-11-13
Abstract
No abstract record available.
Inventors
- 👤 Erwin Windemuth
- 👤 Franzkarl Brochhagen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:39
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/16; C08G18/22; C08G18/161; C08G18/163
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
CA575210A
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DE860109C
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US2948691A
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US2764565A
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GB769681A
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US2846408A
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US2916464A
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US2933462A
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US3084177A
Cited
US3054759A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-16 | 1972-12-16 | 1973-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-16 | 1976-12-16 | 1977-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-16 | 1980-12-16 | 1981-06-17 | $7700.00 | Window Closed / Lapsed |