US2926637A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Portable internal combustion percussion tools
Assignee: Syntron Co
•
Filing: 1956-02-15
•
Granted: 1960-03-01
•
Expires: 1976-02-15
Abstract
No abstract record available.
Inventors
- 👤 William V Spurlin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:51
CPC Classifications
E; E21; E21B; E21B1/00; E21B1/12; E21B1/24; E21B1/30; E21B1/32; E21B1/34
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1666981A
Cited
US1981764A
Cited
US2551988A
Cited
US2479593A
Cited
US2551987A
Cited
GB707255A
Cited
US2684055A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-03-01 | 1963-08-31 | 1964-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-03-01 | 1967-08-31 | 1968-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-03-01 | 1971-08-31 | 1972-03-01 | $7700.00 | Window Closed / Lapsed |