US3437609A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyurethane 1,2-di-(isocyanatomethyl) cyclobutane
Assignee: Bayer AG
•
Filing: 1965-11-17
•
Granted: 1969-04-08
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Expires: 1985-11-17
Abstract
No abstract record available.
Inventors
- 👤 Otto Bayer
- 👤 Rudolf Schrotter
- 👤 Werner Siefken
- 👤 Kuno Wagner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:35
CPC Classifications
C; C07; C07C; C07C265/00; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/74; C08G18/75; C08G18/751; C08G18/752; C08G18/757
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2929800A
Cited
US3124605A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-04-07 | 1972-10-07 | 1973-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-07 | 1976-10-07 | 1977-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-07 | 1980-10-07 | 1981-04-08 | $7700.00 | Window Closed / Lapsed |