US2997541A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Code contracting method
Assignee: International Standard Electric Corp
•
Filing: 1957-02-07
•
Granted: 1961-08-22
•
Expires: 1977-02-07
Abstract
No abstract record available.
Inventors
- 👤 Grottrup Helmut
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:13
CPC Classifications
H; H03; H03M; H03M5/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2471126A
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US2620878A
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US2657856A
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US2647689A
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US2706215A
Cited
USRE23713E
Cited
US2724739A
Cited
US2708267A
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US2811713A
Cited
US2878313A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-08-21 | 1965-02-20 | 1965-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-21 | 1969-02-20 | 1969-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-21 | 1973-02-20 | 1973-08-22 | $7700.00 | Window Closed / Lapsed |