Patent CA491073A successfully refreshed from Google Patents.
Patent US3417636A successfully refreshed from Google Patents.
US3417636A
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Heat transfer apparatus
Assignee: Randolph Manufacturing Co
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Filing: 1966-04-25
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Granted: 1968-12-24
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Expires: 1986-04-25
Abstract
No abstract record available.
Inventors
- 👤 Randolph Troy Dawn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:04
CPC Classifications
F; F04; F04D; F04D13/00; F04D13/02; F04D29/00; F04D29/58; F16; F16H; F16H57/00; F16H57/04; F16H57/0412; F16H57/0415; F16H57/0416; Y; Y10; Y10T; Y10T74/00; Y10T74/21; Y10T74/2186
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1564742A
Cited
US2327962A
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US2352206A
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US2456073A
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US2481914A
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US2511479A
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US2454371A
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US2548805A
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US2594931A
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US2678013A
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US3075690A
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US3285328A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-12-24 | 1972-06-24 | 1972-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-12-24 | 1976-06-24 | 1976-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-12-24 | 1980-06-24 | 1980-12-24 | $7700.00 | Window Closed / Lapsed |