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Patent US3396785A successfully refreshed from Google Patents.
US3396785A
Expired / Lapsed
US
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Heating units
Assignee: Individual
•
Filing: 1965-05-20
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Granted: 1968-08-13
•
Expires: 1985-05-20
Abstract
No abstract record available.
Inventors
- 👤 Kirsch Bernhard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:59
CPC Classifications
F; F28; F28F; F28F21/00; F28F21/06; F28F21/062; F28F21/063; F28D; F28D1/00; F28D1/02; F28D1/04; F28D1/053; F28D1/05308; F28D15/00; F28D15/02; F28F9/00; F28F9/26; F28F9/262; F28F9/268; F28D21/00; F28D2021/0019; F28D2021/0035; F28F9/02; F28F2009/0285; F28F2009/0297; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935
Claims Analysis
Total Claims: 0
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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) | 1971-08-13 | 1972-02-12 | 1972-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-08-13 | 1976-02-12 | 1976-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-08-13 | 1980-02-12 | 1980-08-13 | $7700.00 | Window Closed / Lapsed |