US3539473A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the preparation of foamed sheet and product obtained thereby
Assignee: Dow Chemical Co
•
Filing: 1967-09-21
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Granted: 1970-11-10
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Expires: 1987-09-21
Abstract
No abstract record available.
Inventors
- 👤 Donald W Simpson
- 👤 John Y Glass
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:21
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/12; C08J9/14; C08J9/149; C08J2325/00; Y; Y10; Y10S; Y10S521/00; Y10S521/908; Y10S521/91
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-11-09 | 1974-05-11 | 1974-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-09 | 1978-05-11 | 1978-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-09 | 1982-05-11 | 1982-11-10 | $7700.00 | Window Closed / Lapsed |