US3474753A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Read out ring signalling device
Assignee: AMERLINE CORP
•
Filing: 1968-01-15
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Granted: 1969-10-28
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Expires: 1988-01-15
Abstract
No abstract record available.
Inventors
- 👤 Arthur G Weyrich
- 👤 Werner Engelmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:56
CPC Classifications
G; G11; G11B; G11B23/00; G11B23/02; G11B23/037; G11B15/00; G11B15/02; G11B15/04; G11B15/05; G11B15/06; Y; Y10; Y10S; Y10S242/00; Y10S242/912
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-10-27 | 1973-04-28 | 1973-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-27 | 1977-04-28 | 1977-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-27 | 1981-04-28 | 1981-10-28 | $7700.00 | Window Closed / Lapsed |