Patent US2311837A successfully refreshed from Google Patents.
US2993741A
Expired / Lapsed
US
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Recording mechanism
Assignee: Robertshaw Controls Co
•
Filing: 1955-04-19
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Granted: 1961-07-25
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Expires: 1975-04-19
Abstract
No abstract record available.
Inventors
- 👤 Frederick L Maltby
- 👤 Ernest L Weber
- 👤 Hubert A Riester
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:08
CPC Classifications
G; G01; G01D; G01D9/00; G01D9/28; G01D9/30; Y; Y10; Y10T; Y10T74/00; Y10T74/15; Y10T74/1526; Y10T74/1529; Y10T74/1531
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2425080A
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US1136648A
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US2118081A
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US2125345A
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US2414221A
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US2627755A
Cited
BE517912A
Cited
US2778711A
Cited
US2743986A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-24 | 1965-01-23 | 1965-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-24 | 1969-01-23 | 1969-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-24 | 1973-01-23 | 1973-07-25 | $7700.00 | Window Closed / Lapsed |