US3453221A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Comminution process
Assignee: Polysar Ltd
•
Filing: 1964-01-09
•
Granted: 1969-07-01
•
Expires: 1984-01-09
Abstract
No abstract record available.
Inventors
- 👤 Douglas Stephen Richart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:28
CPC Classifications
B; B01; B01J; B01J2/00; B01J2/20; B05; B05D; B05D1/00; B05D1/18; B05D1/22; B05D1/24; B29; B29B; B29B13/00; B29B13/10; B29C; B29C44/00; B29C44/34; B29C44/36; B29C44/46; B29C44/461; C; C08; C08J; C08J3/00; C08J3/12; C08J2327/00; C08J2327/02; C08J2327/04; C08J2327/06; Y; Y10; Y10S; Y10S241/00; Y10S241/37; Y10S521/00; Y10S521/918
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) | 1972-06-30 | 1972-12-30 | 1973-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-30 | 1976-12-30 | 1977-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-30 | 1980-12-30 | 1981-07-01 | $7700.00 | Window Closed / Lapsed |