US3549526A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Contact process and apparatus
Assignee: Individual
•
Filing: 1968-01-31
•
Granted: 1970-12-22
•
Expires: 1988-01-31
Abstract
No abstract record available.
Inventors
- 👤 Hart Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:54
CPC Classifications
B; B01; B01J; B01J8/00; B01J8/18; B01J8/24; B01J8/44; B01D; B01D15/00; B01D15/02; B01J47/00; B01J47/10; B01J8/20; B01J8/26; B01J8/28; C; C22; C22B; C22B60/00; C22B60/02; C22B60/0204; C22B60/0217; C22B60/0252; C22B60/0265; B01D15/08; B01D15/10; B01D15/18; B01D15/1892
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) | 1973-12-21 | 1974-06-22 | 1974-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-12-21 | 1978-06-22 | 1978-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-12-21 | 1982-06-22 | 1982-12-22 | $7700.00 | Window Closed / Lapsed |