Patent US2851904A successfully refreshed from Google Patents.
Patent US3384623A successfully refreshed from Google Patents.
US3384623A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of polyurethane elastomers
Assignee: Toyobo Co Ltd
•
Filing: 1964-12-31
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Granted: 1968-05-21
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Expires: 1984-12-31
Abstract
No abstract record available.
Inventors
- 👤 Inoue Katsumi
- 👤 Matsui Toshimi
- 👤 Suyama Ikuo
- 👤 Masuda Hiroaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:06
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/67; C08G18/671; C08G18/6715; C08G18/08; C08G18/0838; C08G18/0842; C08G18/0847; C08G18/0852; C08G18/10; C08G18/2805; C08G18/2815; D; D01; D01F; D01F6/00; D01F6/58; D01F6/70; Y; Y10; Y10S; Y10S528/00; Y10S528/906
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2929804A
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US3012993A
Cited
US3189578A
Cited
US3135711A
Cited
US3100759A
Cited
GB917450A
Cited
FR1375793A
Cited
GB1012644A
Cited
US3350361A
Cited
GB1042830A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-05-21 | 1971-11-20 | 1972-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-05-21 | 1975-11-20 | 1976-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-05-21 | 1979-11-20 | 1980-05-21 | $7700.00 | Window Closed / Lapsed |