US3515281A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Backing wire for rotary drum filters
Assignee: Improved Machinery Inc
•
Filing: 1968-05-09
•
Granted: 1970-06-02
•
Expires: 1988-05-09
Abstract
No abstract record available.
Inventors
- 👤 Herbert G Vore
- 👤 Donald E Bardsley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:34
CPC Classifications
B; B01; B01D; B01D33/00; B01D33/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US21768A
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US548263A
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US799153A
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US1020073A
Cited
US1327962A
Cited
US1911310A
Cited
US2165456A
Cited
US2145933A
Cited
US2472558A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-06-01 | 1973-12-01 | 1974-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-06-01 | 1977-12-01 | 1978-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-06-01 | 1981-12-01 | 1982-06-02 | $7700.00 | Window Closed / Lapsed |