US3535828A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Grinding machine
Assignee: Heald Machine Co
•
Filing: 1967-09-11
•
Granted: 1970-10-27
•
Expires: 1987-09-11
Abstract
No abstract record available.
Inventors
- 👤 Donald E Ware Jr
- 👤 John Klar
- 👤 Norman S Humes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:55
CPC Classifications
B; B24; B24B; B24B49/00; B24B49/16; B24B49/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2168596A
Cited
US2961808A
Cited
US3019565A
Cited
US3158965A
Cited
US3131517A
Cited
US3197921A
Cited
US3341980A
Cited
US3403480A
Cited
US3420008A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-10-26 | 1974-04-27 | 1974-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-10-26 | 1978-04-27 | 1978-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-10-26 | 1982-04-27 | 1982-10-27 | $7700.00 | Window Closed / Lapsed |