US2935577A
Expired / Lapsed
US
⏱️ 0.0 years remaining
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Assignee: Switchcraft Inc
•
Filing: 1957-11-05
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Granted: 1960-05-03
•
Expires: 1977-11-05
Abstract
No abstract record available.
Inventors
- 👤 William E Dumke
- 👤 James R Bailey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:55
CPC Classifications
H; H01; H01H; H01H13/00; H01H13/70; H01H13/72; H01H13/74; H03; H03J; H03J5/00; H03J5/24; H03J5/26; H03J5/32
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US679310A
Cited
GB207016A
Cited
GB304819A
Cited
DE693593C
Cited
US2200076A
Cited
US2414307A
Cited
US2831075A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-05-03 | 1963-11-02 | 1964-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-03 | 1967-11-02 | 1968-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-03 | 1971-11-02 | 1972-05-03 | $7700.00 | Window Closed / Lapsed |