Patent US536785A successfully refreshed from Google Patents.
Patent US2801084A successfully refreshed from Google Patents.
US2801084A
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US
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Differential injection rotary heater
Assignee: Gerber Products Co
•
Filing: 1954-08-26
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Granted: 1957-07-30
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Expires: 1974-08-26
Abstract
No abstract record available.
Inventors
- 👤 Robert F Krupp
- 👤 Jan K Wagner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:18
CPC Classifications
A; A23; A23B; A23B2/00; A23B2/40; A23B2/42; A23B2/10; Y; Y10; Y10S; Y10S261/00; Y10S261/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US429850A
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US1533409A
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US2245112A
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US2239497A
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US2252076A
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US2352767A
Cited
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US2492635A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-07-29 | 1961-01-28 | 1961-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-07-29 | 1965-01-28 | 1965-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-07-29 | 1969-01-28 | 1969-07-30 | $7700.00 | Window Closed / Lapsed |