Patent US3520418A successfully refreshed from Google Patents.
US3520418A
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US
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Filter elements and the manufacture thereof
Assignee: ETABLIS POMPES GUINARD
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Filing: 1967-01-17
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Granted: 1970-07-14
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Expires: 1987-01-17
Abstract
No abstract record available.
Inventors
- 👤 Paul Andre Guinard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:09
CPC Classifications
B; B21; B21D; B21D31/00; B21D31/02; B01; B01D; B01D29/00; B01D29/01; B01D29/012; B01D33/00; B01D33/06; B01D33/11; B01D33/44; B01D33/46; B01D33/466; B04; B04B; B04B7/00; B04B7/08; B04B7/12; B04B7/16; B01D2201/00; B01D2201/02; B01D2201/18; B01D2201/184; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/496; Y10T29/49604
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) | 1973-07-13 | 1974-01-12 | 1974-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-13 | 1978-01-12 | 1978-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-13 | 1982-01-12 | 1982-07-14 | $7700.00 | Window Closed / Lapsed |