Patent US2743759A successfully refreshed from Google Patents.
US3496339A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical heating systems
Assignee: Dunlop Co Ltd
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Filing: 1967-04-12
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Granted: 1970-02-17
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Expires: 1987-04-12
Abstract
No abstract record available.
Inventors
- 👤 Donald Portas
- 👤 Charles Aneurin Davies
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:48
CPC Classifications
G; G05; G05D; G05D23/00; G05D23/19; G05D23/20; G05D23/24; G05D23/2401; G05D23/1906; G05D23/1913
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) | 1973-02-16 | 1973-08-18 | 1974-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-02-16 | 1977-08-18 | 1978-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-02-16 | 1981-08-18 | 1982-02-17 | $7700.00 | Window Closed / Lapsed |