US2442042A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Grinding apparatus
Assignee: Individual
•
Filing: 1946-03-19
•
Granted: 1948-05-25
•
Expires: 1966-03-19
Abstract
No abstract record available.
Inventors
- 👤 Alfred E Hamilton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:34
CPC Classifications
B; B24; B24B; B24B7/00; B24B7/07; B24B7/075; Y; Y10; Y10S; Y10S451/00; Y10S451/915; Y10T; Y10T83/00; Y10T83/283; Y10T83/293
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US411839A
Cited
US725142A
Cited
US1866212A
Cited
GB340910A
Cited
US1952334A
Cited
US2308843A
Cited
US2403341A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-05-25 | 1951-11-24 | 1952-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-05-25 | 1955-11-24 | 1956-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-05-25 | 1959-11-24 | 1960-05-25 | $7700.00 | Window Closed / Lapsed |