US3020977A
Expired / Lapsed
US
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Assignee: Simpson Herbert Corp
•
Filing: 1959-08-19
•
Granted: 1962-02-13
•
Expires: 1979-08-19
Abstract
No abstract record available.
Inventors
- 👤 Glen P Huppke
- 👤 Robert L Mcilvaine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:21
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/52; B01D46/521; B01D46/525; B01D2265/00; B01D2265/04; B01D2275/00; B01D2275/20; B01D2275/206; Y; Y10; Y10S; Y10S493/00; Y10S493/941; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1025; Y10T156/1028
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2190683A
Cited
US2222548A
Cited
US2190886A
Cited
GB540215A
Cited
US2355373A
Cited
US2397759A
Cited
US2403261A
Cited
US2669995A
Cited
GB703823A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-02-12 | 1965-08-14 | 1966-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-02-12 | 1969-08-14 | 1970-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-02-12 | 1973-08-14 | 1974-02-13 | $7700.00 | Window Closed / Lapsed |