Patent US3309787A successfully refreshed from Google Patents.
US3309787A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Grate coolers
Assignee: Vinters Armstrongs Ltd
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Filing: 1964-03-30
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Granted: 1967-03-21
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Expires: 1984-03-30
Abstract
No abstract record available.
Inventors
- 👤 Forsyth George Howard
- 👤 Taylor Joseph Hendrick
- 👤 Graut Andrew Campbell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:26
CPC Classifications
F; F27; F27D; F27D15/00; F27D15/02; F27D15/0206; F27D15/0273; F28; F28C; F28C3/00; F28C3/10; F28C3/12; F28C3/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
138 words
A HEAT EXCHANGER COMPRISING A HOUSING, A ROTATABLE ANNULAR GRATE MOUNTED IN SAID HOUSING AND CONSTRUCTED AND ARRANGED TO SUPPORT MATERIAL IN A GRANULAR OR NODULAR FORM, A FIRST SCRAPER CARRIED BY SAID HOUSING AND ARRANGED ABOVE AND ADJACENT THE GRATE FOR REMOVING SAID MATERIAL FROM THE GRATE, MEANS FOR PASSING GASES THROUGH THE GRATE AND THROUGH THE MATERIAL THEREON TO EFFECT HEAT EXCHANGE BETWEEN THE MATERIAL AND THE GASES WHILE THE MATERIAL IS BEING CARRIED TO THE SCRAPER BY THE ROTATING GRATE, PORTIONS OF SAID HOUSING DEFINING AN UPWARDLY FACING SURFACE BENEATH SAID GRATE SPACED FROM SAID GRATE FOR RECEIVING MATERIAL DROPPINGS FROM SAID GRATE, OTHER PORTIONS OF SAID HOUSING DEFINING AN OUTLET OPENING IN SAID SURFACE, AND A SECOND SCRAPER CARRIED BY SAID GRATE AND ARRANGED BENEATH SAID GRATE AND CONSTRUCTED AND ARRANGED TO ROTATE WITH
Claim 2
Dependent Claim
138 words
A HEAT EXCHANGER COMPRISING A HOUSING, A ROTATABLE ANNULAR GRATE MOUNTED IN SAID HOUSING AND CONSTRUCTED AND ARRANGED TO SUPPORT MATERIAL IN A GRANULAR OR NODULAR FORM, A FIRST SCRAPER CARRIED BY SAID HOUSING AND ARRANGED ABOVE AND ADJACENT THE GRATE FOR REMOVING SAID MATERIAL FROM THE GRATE, MEANS FOR PASSING GASES THROUGH THE GRATE AND THROUGH THE MATERIAL THEREON TO EFFECT HEAT EXCHANGE BETWEEN THE MATERIAL AND THE GASES WHILE THE MATERIAL IS BEING CARRIED TO THE SCRAPER BY THE ROTATING GRATE, PORTIONS OF SAID HOUSING DEFINING AN UPWARDLY FACING SURFACE BENEATH SAID GRATE SPACED FROM SAID GRATE FOR RECEIVING MATERIAL DROPPINGS FROM SAID GRATE, OTHER PORTIONS OF SAID HOUSING DEFINING AN OUTLET OPENING IN SAID SURFACE, AND A SECOND SCRAPER CARRIED BY SAID GRATE AND ARRANGED BENEATH SAID GRATE AND CONSTRUCTED AND ARRANGED TO ROTATE WITH
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-03-20 | 1970-09-19 | 1971-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-20 | 1974-09-19 | 1975-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-20 | 1978-09-19 | 1979-03-21 | $7700.00 | Window Closed / Lapsed |