US3367501A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dry-cleaning of large or small coal or other particulate materials containing components of different specific gravities
Assignee: Head Wrightson and Co Ltd
•
Filing: 1965-04-14
•
Granted: 1968-02-06
•
Expires: 1985-04-14
Abstract
No abstract record available.
Inventors
- 👤 Eveson Geoffrey Frank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:28
CPC Classifications
B; B03; B03B; B03B5/00; B03B5/28; B03B5/46; B03B4/00; B03B4/02; F; F23; F23K; F23K2900/00; F23K2900/01001
Claims Analysis
Total Claims: 0
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US2850166A
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US2910179A
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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) | 1971-02-05 | 1971-08-07 | 1972-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-02-05 | 1975-08-07 | 1976-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-02-05 | 1979-08-07 | 1980-02-06 | $7700.00 | Window Closed / Lapsed |