US2717192A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recording apparatus
Assignee: Individual
•
Filing: 1949-06-14
•
Granted: 1955-09-06
•
Expires: 1969-06-14
Abstract
No abstract record available.
Inventors
- 👤 Ralph R Chappell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:47
CPC Classifications
G; G01; G01D; G01D9/00; G01D9/40; Y; Y10; Y10T; Y10T74/00; Y10T74/15; Y10T74/1558; Y10T74/1565; Y10T74/1566; Y10T74/1574; Y10T74/1577; Y10T74/1579
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US483102A
Cited
GB191100969A
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US1356116A
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US1466050A
Cited
US1547528A
Cited
US1620224A
Cited
US1827178A
Cited
GB335347A
Cited
US1958909A
Cited
US2085224A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-09-05 | 1959-03-07 | 1959-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-09-05 | 1963-03-07 | 1963-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-09-05 | 1967-03-07 | 1967-09-06 | $7700.00 | Window Closed / Lapsed |