US3067310A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microfilm electric heaters
Assignee: Individual
•
Filing: 1959-12-02
•
Granted: 1962-12-04
•
Expires: 1979-12-02
Abstract
No abstract record available.
Inventors
- 👤 Frank C Walz
- 👤 William D Oliver
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:51
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/20; H05B3/22; H05B3/26; H05B2203/00; H05B2203/013; H05B2203/017; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1422136A
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US2583000A
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US2569773A
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US2679569A
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US2739083A
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US2715668A
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US2808351A
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US2787694A
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US2795682A
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US2939807A
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US2921257A
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US2977450A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-12-03 | 1966-06-04 | 1966-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-12-03 | 1970-06-04 | 1970-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-12-03 | 1974-06-04 | 1974-12-04 | $7700.00 | Window Closed / Lapsed |