Patent US2902549A successfully refreshed from Google Patents.
US2902549A
Expired / Lapsed
US
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Multiple unit pile-up switch
Assignee: Executone Inc
•
Filing: 1956-08-31
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Granted: 1959-09-01
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Expires: 1976-08-31
Abstract
No abstract record available.
Inventors
- 👤 Allan C Bernstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:28
CPC Classifications
H; H01; H01H; H01H1/00; H01H1/12; H01H1/14; H01H1/24; H01H1/26; H01H1/28; H01H15/00; H01H15/02; H01H15/06; H01H15/10; H01H15/102; H01H2001/265
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1199843A
Cited
US1784898A
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US1792496A
Cited
US2154338A
Cited
US2414307A
Cited
US2740870A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-08-31 | 1963-03-02 | 1963-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-31 | 1967-03-02 | 1967-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-31 | 1971-03-02 | 1971-09-01 | $7700.00 | Window Closed / Lapsed |