Patent US2307662A successfully refreshed from Google Patents.
US2622469A
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Method of and apparatus for controlling the temperature of plastic material
Assignee: AT&T Inc
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Filing: 1951-05-04
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Granted: 1952-12-23
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Expires: 1971-05-04
Abstract
No abstract record available.
Inventors
- 👤 Alvin N Gray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:42
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/78; B29C48/875; B29C48/80; B29C48/84; B29C48/85; B29C48/03; B29C48/07; B29C48/08; B29C48/36; B29C48/50; B29C48/505; B29C48/51; B29C48/515; B29C48/83; B29C48/832; B29C48/834
Claims Analysis
Total Claims: 0
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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) | 1955-12-23 | 1956-06-23 | 1956-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-23 | 1960-06-23 | 1960-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-23 | 1964-06-23 | 1964-12-23 | $7700.00 | Window Closed / Lapsed |