Patent US2641689A successfully refreshed from Google Patents.
US2641689A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pneumatic signaling
Assignee: Individual
•
Filing: 1950-01-12
•
Granted: 1953-06-09
•
Expires: 1970-01-12
Abstract
No abstract record available.
Inventors
- 👤 Edward J Poitras
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:44
CPC Classifications
B; B61; B61K; B61K9/00; B61K9/04; Y; Y10; Y10S; Y10S116/00; Y10S116/38
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1318369A
Cited
US679945A
Cited
US700766A
Cited
US823114A
Cited
US800751A
Cited
US928459A
Cited
US1001084A
Cited
US1058993A
Cited
US1068675A
Cited
US1270954A
Cited
US1512456A
Cited
US1600527A
Cited
US1758711A
Cited
US1820147A
Cited
US1910513A
Cited
US2114762A
Cited
US2181225A
Cited
US2187958A
Cited
US2357620A
Cited
US2339436A
Cited
US2304839A
Cited
US2420924A
Cited
US2385487A
Cited
US2429817A
Cited
US2486546A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-08 | 1956-12-08 | 1957-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-08 | 1960-12-08 | 1961-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-08 | 1964-12-08 | 1965-06-09 | $7700.00 | Window Closed / Lapsed |