US3528481A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Core making machine with hardening gas manifold
Assignee: Pettibone Corp
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Filing: 1968-10-17
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Granted: 1970-09-15
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Expires: 1988-10-17
Abstract
No abstract record available.
Inventors
- 👤 Robert S Lund
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:14
CPC Classifications
B; B22; B22C; B22C9/00; B22C9/12; B22C9/123; B22C15/00; B22C15/23; B22C15/24; B22C17/00; B22C17/08; B22C7/00; B22C7/06; B22C7/067
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3059294A
Cited
US3060534A
Cited
US3089205A
Cited
US3096547A
Cited
US3247545A
Cited
US3398781A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-09-14 | 1974-03-16 | 1974-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-09-14 | 1978-03-16 | 1978-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-09-14 | 1982-03-16 | 1982-09-15 | $7700.00 | Window Closed / Lapsed |