US2804661A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shell mold making machines
Assignee: Individual
•
Filing: 1953-08-31
•
Granted: 1957-09-03
•
Expires: 1973-08-31
Abstract
No abstract record available.
Inventors
- 👤 Thomas K Hutchinson
- 👤 Hutchinson Oliver C Kemp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 04:26
CPC Classifications
B; B22; B22C; B22C23/00; Y; Y10; Y10S; Y10S425/00; Y10S425/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US852494A
Cited
US1869900A
Cited
US2023139A
Cited
US2218502A
Cited
US2248010A
Cited
DE832936C
Cited
US2566824A
Cited
US2659944A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-02 | 1961-03-04 | 1961-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-02 | 1965-03-04 | 1965-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-02 | 1969-03-04 | 1969-09-03 | $7700.00 | Window Closed / Lapsed |