US3447685A
Expired / Lapsed
US
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Assignee: JOHN H BIRCHER
•
Filing: 1966-12-07
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Granted: 1969-06-03
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Expires: 1986-12-07
Abstract
No abstract record available.
Inventors
- 👤 John H Bircher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 20:31
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/04; A; A47; A47J; A47J37/00; A47J37/12; A47J37/1223; B; B01; B01D; B01D35/00; B01D35/26; F04D7/00; F04D7/02; F04D7/04
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) | 1972-06-02 | 1972-12-02 | 1973-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-02 | 1976-12-02 | 1977-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-02 | 1980-12-02 | 1981-06-03 | $7700.00 | Window Closed / Lapsed |