US3329271A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Trickling filter media
Assignee: TEXAS VITRIFIED PIPE CO
•
Filing: 1962-06-21
•
Granted: 1967-07-04
•
Expires: 1982-06-21
Abstract
No abstract record available.
Inventors
- 👤 Thomas D Ward
- 👤 Smith Mansel Watt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:48
CPC Classifications
B; B01; B01J; B01J19/00; B01J19/32; C; C02; C02F; C02F3/00; C02F3/02; C02F3/10; C02F3/101; B01J2219/00; B01J2219/32; B01J2219/322; B01J2219/32279; B01J2219/324; B01J2219/32483; Y; Y02; Y02W; Y02W10/00; Y02W10/10
Claims Analysis
Total Claims: 0
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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) | 1970-07-03 | 1971-01-02 | 1971-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-07-03 | 1975-01-02 | 1975-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-07-03 | 1979-01-02 | 1979-07-04 | $7700.00 | Window Closed / Lapsed |