US1683809A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control system
Assignee: Leeds and Northrup Co
•
Filing: 1924-05-10
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Granted: 1928-09-11
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Expires: 1944-05-10
Abstract
No abstract record available.
Inventors
- 👤 Jr William R Schofield
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:02
CPC Classifications
F; F16; F16K; F16K31/00; F16K31/02; F16K31/04; F16K31/05
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) | 1931-09-11 | 1932-03-12 | 1932-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1935-09-11 | 1936-03-12 | 1936-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1939-09-11 | 1940-03-12 | 1940-09-11 | $7700.00 | Window Closed / Lapsed |