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US2423480A
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Multiple recording instrument
Assignee: Brown Instruments Co
•
Filing: 1942-06-20
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Granted: 1947-07-08
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Expires: 1962-06-20
Abstract
No abstract record available.
Inventors
- 👤 John A Caldwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:28
CPC Classifications
G; G01; G01N; G01N35/00; G01D; G01D15/00; G01D15/20; G01D15/24; G01K; G01K7/00; G01R; G01R1/00; G01R1/02; Y; Y10; Y10T; Y10T74/00; Y10T74/22
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US513213A
Cited
US447301A
Cited
US1192317A
Cited
US1283309A
Cited
US1898183A
Cited
US1744746A
Cited
US1898124A
Cited
US1926640A
Cited
US1848423A
Cited
US2150502A
Cited
US1934882A
Cited
US2031050A
Cited
US1971313A
Cited
US2115528A
Cited
US2129762A
Cited
US2074118A
Cited
US2190912A
Cited
US2191673A
Cited
US2193096A
Cited
US2207344A
Cited
US2125345A
Cited
US2252301A
Cited
US2205299A
Cited
US2211148A
Cited
US2209717A
Cited
US2328664A
Cited
US2273760A
Cited
US2275246A
Cited
US2227600A
Cited
US2280459A
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 |