US2820433A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hammer pistons for percussion machine and tools
Assignee: Atlas Copco AB
•
Filing: 1952-07-01
•
Granted: 1958-01-21
•
Expires: 1972-07-01
Abstract
No abstract record available.
Inventors
- 👤 Pyk Herman Theodor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:26
CPC Classifications
B; B25; B25D; B25D17/00; B25D17/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1030871A
Cited
US1110063A
Cited
US1167975A
Cited
US1739338A
Cited
US1700604A
Cited
AT112085B
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-20 | 1961-07-22 | 1962-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-20 | 1965-07-22 | 1966-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-20 | 1969-07-22 | 1970-01-21 | $7700.00 | Window Closed / Lapsed |