Patent US2972848A successfully refreshed from Google Patents.
Patent US2447312A successfully refreshed from Google Patents.
US2447312A
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Expansible chamber motor with piston actuated valve for jolting machines
Assignee: Syntron Co
•
Filing: 1944-01-26
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Granted: 1948-08-17
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Expires: 1964-01-26
Abstract
No abstract record available.
Inventors
- 👤 Burt Ralph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:17
CPC Classifications
B; B06; B06B; B06B1/00; B06B1/18; B06B1/183; B22; B22C; B22C15/00; B22C15/10; Y; Y10; Y10S; Y10S116/00; Y10S116/18
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-08-17 | 1952-02-16 | 1952-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-08-17 | 1956-02-16 | 1956-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-08-17 | 1960-02-16 | 1960-08-17 | $7700.00 | Window Closed / Lapsed |