US2908226A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Intermeshing screw pumps and the like
Assignee: Improved Machinery Inc
•
Filing: 1956-12-31
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Granted: 1959-10-13
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Expires: 1976-12-31
Abstract
No abstract record available.
Inventors
- 👤 John P Rich
- 👤 Luthi Oscar
- 👤 Walter N Thompson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 07:04
CPC Classifications
B; B01; B01F; B01F27/00; B01F27/60; B01F27/72; B01F27/721; B01F27/722; B01F27/723; B29; B29C; B29C48/00; B29C48/03; B29C48/25; B29C48/36; B29C48/395; B29C48/40; B29C48/402; B29C48/404; B29C48/50; B29C48/505; B29C48/52; B30; B30B; B30B11/00; B30B11/22; B30B11/24; B30B11/243; F; F04; F04C; F04C3/00; F04C3/06; F04C3/08; F04C3/085; B29C48/268; F04C2250/00; F04C2250/20; F04C2250/201; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19949; Y10T74/19953
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1735477A
Cited
GB347246A
Cited
DE617432C
Cited
US2048286A
Cited
FR789211A
Cited
US2477797A
Cited
US2592476A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-10-12 | 1963-04-13 | 1963-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-10-12 | 1967-04-13 | 1967-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-10-12 | 1971-04-13 | 1971-10-13 | $7700.00 | Window Closed / Lapsed |