US2481648A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for combining variable quantities
Assignee: AT&T Inc
•
Filing: 1943-09-15
•
Granted: 1949-09-13
•
Expires: 1963-09-15
Abstract
No abstract record available.
Inventors
- 👤 William F Dehn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:47
CPC Classifications
G; G06; G06G; G06G3/00; Y; Y10; Y10T; Y10T74/00; Y10T74/18; Y10T74/18992; Y10T74/21; Y10T74/2101; Y10T74/2102
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2319891A
Cited
US580783A
Cited
GB113136A
Cited
GB140441A
Cited
GB193452A
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US1453688A
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FR589389A
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US1520514A
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DE415286C
Cited
US1751646A
Cited
GB291841A
Cited
US1986986A
Cited
FR719544A
Cited
DE630801C
Cited
US2077523A
Cited
US2222551A
Cited
US2179822A
Cited
US2229156A
Cited
US2319322A
Cited
GB499265A
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US2369420A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-09-12 | 1953-03-14 | 1953-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-09-12 | 1957-03-14 | 1957-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-09-12 | 1961-03-14 | 1961-09-13 | $7700.00 | Window Closed / Lapsed |