US1377274A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control apparatus
Assignee: PYROLECTRIC INSTR CO
•
Filing: 1919-06-03
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Granted: 1921-05-10
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Expires: 1939-06-03
Abstract
No abstract record available.
Inventors
- 👤 Harry F Porter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 17:18
CPC Classifications
G; G01; G01R; G01R13/00; G01R13/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1924-05-09 | 1924-11-08 | 1925-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1928-05-09 | 1928-11-08 | 1929-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1932-05-09 | 1932-11-08 | 1933-05-10 | $7700.00 | Window Closed / Lapsed |