US2850847A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Internal grinding machine
Assignee: Heald Machine Co
•
Filing: 1954-12-07
•
Granted: 1958-09-09
•
Expires: 1974-12-07
Abstract
No abstract record available.
Inventors
- 👤 Almon F Townsend
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:46
CPC Classifications
B; B24; B24B; B24B49/00; B24B49/18; B24B5/00; B24B5/02; B24B5/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1862215A
Cited
US1812003A
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US2012065A
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GB374918A
Cited
US1997551A
Cited
US2097429A
Cited
US2502862A
Cited
US2582610A
Cited
US2677921A
Cited
US2648171A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-09-08 | 1962-03-10 | 1962-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-08 | 1966-03-10 | 1966-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-08 | 1970-03-10 | 1970-09-09 | $7700.00 | Window Closed / Lapsed |