US3538307A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric baseboard heater
Assignee: CUSTOM ELECTRIC Mfg AND DIST CO Inc
•
Filing: 1968-09-03
•
Granted: 1970-11-03
•
Expires: 1988-09-03
Abstract
No abstract record available.
Inventors
- 👤 Nelson Birdwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:53
CPC Classifications
F; F24; F24D; F24D13/00; F24D13/04; F24H; F24H3/00; F24H3/002; F24H3/004; Y; Y10; Y10S; Y10S165/00; Y10S165/903
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1775152A
Cited
US1778464A
Cited
US2051485A
Cited
CH230458A
Cited
US2432917A
Cited
US2797295A
Cited
US2894108A
Cited
US3166666A
Cited
US3179788A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-11-02 | 1974-05-04 | 1974-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-02 | 1978-05-04 | 1978-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-02 | 1982-05-04 | 1982-11-03 | $7700.00 | Window Closed / Lapsed |