US3535494A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric heating mat
Assignee: Individual
•
Filing: 1967-10-04
•
Granted: 1970-10-20
•
Expires: 1987-10-04
Abstract
No abstract record available.
Inventors
- 👤 Fritz Armbruster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:51
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/10; H05B3/12; H05B3/14; H05B3/146; F; F24; F24D; F24D13/00; F24D13/02; Y; Y02; Y02B; Y02B30/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2340097A
Cited
US2559077A
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US2688070A
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US2715668A
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US3033970A
Cited
FR1230097A
Cited
US3221145A
Cited
US3277419A
Cited
US3287684A
Cited
US3281579A
Cited
US3385959A
Cited
US3397302A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-10-19 | 1974-04-20 | 1974-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-10-19 | 1978-04-20 | 1978-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-10-19 | 1982-04-20 | 1982-10-20 | $7700.00 | Window Closed / Lapsed |