US3539684A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bactericidal polymers
Assignee: Calgon Corp
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Filing: 1968-11-21
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Granted: 1970-11-10
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Expires: 1988-11-21
Abstract
No abstract record available.
Inventors
- 👤 Merwin Frederick Hoover
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:35
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/50; A; A01; A01N; A01N31/00; A01N31/08; A01N31/12; A01N37/00; A01N37/12; A01N43/00; A01N43/34; A01N43/40; C08; C08F; C08F26/00; C08F26/02; C08F26/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2595225A
Cited
US2980657A
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US2980634A
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US2923701A
Cited
US3147218A
Cited
US3288770A
Cited
GB1059117A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-11-09 | 1974-05-11 | 1974-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-09 | 1978-05-11 | 1978-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-09 | 1982-05-11 | 1982-11-10 | $7700.00 | Window Closed / Lapsed |