US2816523A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for vacuum coating electrical resistors
Assignee: Polytechnic Res & Dev Co Inc
•
Filing: 1954-04-09
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Granted: 1957-12-17
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Expires: 1974-04-09
Abstract
No abstract record available.
Inventors
- 👤 Stanley A Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 08:13
CPC Classifications
B; B05; B05C; B05C13/00; B05C13/02; B05C13/025
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1382149A
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US2123227A
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US2339008A
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US2445310A
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US2516908A
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US2586752A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-12-16 | 1961-06-17 | 1961-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-16 | 1965-06-17 | 1965-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-16 | 1969-06-17 | 1969-12-17 | $7700.00 | Window Closed / Lapsed |