US3491889A
Expired / Lapsed
US
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Assignee: THEODORE M WALTERS
•
Filing: 1967-11-27
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Granted: 1970-01-27
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Expires: 1987-11-27
Abstract
No abstract record available.
Inventors
- 👤 Theodore M Walters
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:25
CPC Classifications
B; B01; B01D; B01D37/00; B01D37/04; B01D29/00; B01D29/11; B01D29/13; B01D29/15; B01D29/39; B01D29/41; B01D29/50; B01D29/52; B01D29/54; B01D29/62; B01D29/66; B01D29/666; B01D29/88; B01D29/90; B01D29/902
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) | 1973-01-26 | 1973-07-28 | 1974-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-26 | 1977-07-28 | 1978-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-26 | 1981-07-28 | 1982-01-27 | $7700.00 | Window Closed / Lapsed |