US2508602A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Porous filter powder
Assignee: Sunshine Mining Co
•
Filing: 1943-09-09
•
Granted: 1950-05-23
•
Expires: 1963-09-09
Abstract
No abstract record available.
Inventors
- 👤 Goetz Alexander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:49
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/22; B01J20/26; B01J20/261; B01J20/02; B01J20/0203; B01J20/0233; B01J20/06; B01J20/10; B01J20/14; B01J20/20; B01J20/264; B01J20/28; B01J20/28014; B01J20/28026; B01J20/30; B01J20/32; B01J20/3202; B01J20/3204; B01J20/3231; B01J20/3242; B01J20/3268; B01J20/327; B01J20/3276; C; C02; C02F; C02F1/00; C02F1/50; C02F1/505
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
58 words
A POROUS FILTER POWDER COMPRISING DIATOMS AND A PLASTIC COATING ON EACH INDIVIDUAL DIATOM, SAID PLASTIC OF SAID COATING BEING ONE OF THE COPOLYMERS OF VINYL DERIVATIVES HAVING APPROXIMATELY 85% VINYL ACETATE AND APPROXMATELY 15% VINYL CHLORIDE IN ITS COMPOSITION AND HAVING THE PROPERTY OF ABSORBING WATER AND SWELLING TO INCREASED VOLUME OF SAID COATING UPON SAID ABSORPTION.
Claim 2
Dependent Claim
58 words
A POROUS FILTER POWDER COMPRISING DIATOMS AND A PLASTIC COATING ON EACH INDIVIDUAL DIATOM, SAID PLASTIC OF SAID COATING BEING ONE OF THE COPOLYMERS OF VINYL DERIVATIVES HAVING APPROXIMATELY 85% VINYL ACETATE AND APPROXMATELY 15% VINYL CHLORIDE IN ITS COMPOSITION AND HAVING THE PROPERTY OF ABSORBING WATER AND SWELLING TO INCREASED VOLUME OF SAID COATING UPON SAID ABSORPTION.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-05-22 | 1953-11-21 | 1954-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-05-22 | 1957-11-21 | 1958-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-05-22 | 1961-11-21 | 1962-05-23 | $7700.00 | Window Closed / Lapsed |