US3500503A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mechanical seal for use on molding apparatus
Assignee: Dow Chemical Co
•
Filing: 1967-12-28
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Granted: 1970-03-17
•
Expires: 1987-12-28
Abstract
No abstract record available.
Inventors
- 👤 Kenneth J Cleereman
- 👤 Edward R Sederlund
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:53
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/17; B29C45/46; B29C45/56; B29C45/5605
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3371387A
Cited
US3389434A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-03-16 | 1973-09-15 | 1974-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-03-16 | 1977-09-15 | 1978-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-03-16 | 1981-09-15 | 1982-03-17 | $7700.00 | Window Closed / Lapsed |