US3440309A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of expanded thermoplastic products
Assignee: Shell USA Inc
•
Filing: 1965-03-26
•
Granted: 1969-04-22
•
Expires: 1985-03-26
Abstract
No abstract record available.
Inventors
- 👤 Carel J Breukink
- 👤 Jacob Vermeulen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 01:53
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/12; C08J9/14; C08J9/141; Y; Y10; Y10S; Y10S264/00; Y10S264/05
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3200176A
Cited
US3344215A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-04-21 | 1972-10-21 | 1973-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-21 | 1976-10-21 | 1977-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-21 | 1980-10-21 | 1981-04-22 | $7700.00 | Window Closed / Lapsed |