US3501133A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spargers with auxiliary tubes for dependable drain and wide range air flow
Assignee: Chicago Bridge and Iron Co
•
Filing: 1969-04-23
•
Granted: 1970-03-17
•
Expires: 1989-04-23
Abstract
No abstract record available.
Inventors
- 👤 Douglas E Dreier
- 👤 James Donald Walker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:08
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/02; C02F3/12; C02F3/20; B; B01; B01F; B01F23/00; B01F23/20; B01F23/23; B01F23/231; B01F23/23105; B01F23/2311; B01F23/2312; B01F23/23121; B01F23/23113; B01F23/23114; B01F23/231143; Y; Y02; Y02W; Y02W10/00; Y02W10/10; Y10; Y10S; Y10S261/00; Y10S261/70
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1098190A
Cited
GB239271A
Cited
US2050117A
Cited
US2911205A
Cited
US3153682A
Cited
AT195355B
Cited
US3242072A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-03-16 | 1973-09-15 | 1974-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-03-16 | 1977-09-15 | 1978-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-03-16 | 1981-09-15 | 1982-03-17 | $7700.00 | Window Closed / Lapsed |