Patent US2423479A successfully refreshed from Google Patents.
US2423479A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Measuring, recording, and controlling apparatus
Assignee: Brown Instruments Co
•
Filing: 1941-12-01
•
Granted: 1947-07-08
•
Expires: 1961-12-01
Abstract
No abstract record available.
Inventors
- 👤 John A Caldwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:48
CPC Classifications
G; G05; G05D; G05D23/00; G05D23/19; G05D23/20; G05D23/22; G05D23/2236; G05D23/2237; G01; G01D; G01D11/00; G01D11/30
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US499429A
Cited
US613811A
Cited
US1338766A
Cited
US2080789A
Cited
US812476A
Cited
US979589A
Cited
US1116498A
Cited
US1567018A
Cited
US1811417A
Cited
US1817432A
Cited
US1862489A
Cited
US1932816A
Cited
US1914918A
Cited
US1857311A
Cited
US2099466A
Cited
US2106030A
Cited
US2074117A
Cited
US2093119A
Cited
US2255888A
Cited
US2203689A
Cited
US2300537A
Cited
US2279551A
Cited
US2283304A
Cited
US2293299A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-07-07 | 1951-01-06 | 1951-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-07-07 | 1955-01-06 | 1955-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-07-07 | 1959-01-06 | 1959-07-08 | $7700.00 | Window Closed / Lapsed |