Patent US2843209A successfully refreshed from Google Patents.
US2843209A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter, especially for piped wells
Assignee: Individual
•
Filing: 1952-12-27
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Granted: 1958-07-15
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Expires: 1972-12-27
Abstract
No abstract record available.
Inventors
- 👤 Degen Wilhelm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:17
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/02; E21B43/08; E21B43/082
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
35 words
A UNITARY FILTER CONTAINING OF A PREFORATED MEMBER AND A PERMEABLE FILTER BODY OF GRANULAR MATERIAL, SAID GRANULAR MATERIAL BEING CEMENTED TOGETHER BY AN INSOLUBLE BINDING AGENT AND BEING PERMANENTLY ADHERED TO THE PORFORATED MEMBER.
Claim 2
Dependent Claim
35 words
A UNITARY FILTER CONTAINING OF A PREFORATED MEMBER AND A PERMEABLE FILTER BODY OF GRANULAR MATERIAL, SAID GRANULAR MATERIAL BEING CEMENTED TOGETHER BY AN INSOLUBLE BINDING AGENT AND BEING PERMANENTLY ADHERED TO THE PORFORATED MEMBER.
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) | 1961-07-14 | 1962-01-13 | 1962-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-07-14 | 1966-01-13 | 1966-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-07-14 | 1970-01-13 | 1970-07-15 | $7700.00 | Window Closed / Lapsed |