Patent US3385833A successfully refreshed from Google Patents.
US3385833A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing polyurethanes
Assignee: EIDP Inc
•
Filing: 1965-01-08
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Granted: 1968-05-28
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Expires: 1985-01-08
Abstract
No abstract record available.
Inventors
- 👤 Pariser Rudolph
- 👤 William K Witsiepe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:05
CPC Classifications
C; C08; C08L; C08L75/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB685729A
Cited
US2929800A
Cited
DE1061071B
Cited
US2929802A
Cited
US2808391A
Cited
US2970987A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-05-28 | 1971-11-27 | 1972-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-05-28 | 1975-11-27 | 1976-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-05-28 | 1979-11-27 | 1980-05-28 | $7700.00 | Window Closed / Lapsed |