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Patent US3390217A successfully refreshed from Google Patents.
US3390217A
Expired / Lapsed
US
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Method to prevent warping of hot embossed disk records by prehetaing the central annulus
Assignee: Decca Ltd
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Filing: 1964-09-11
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Granted: 1968-06-25
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Expires: 1984-09-11
Abstract
No abstract record available.
Inventors
- 👤 Phillipson Alan
- 👤 Spiller Basil Harry Royston
- 👤 Smith Robin
- 👤 Cheesman Harry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:42
CPC Classifications
B; B29; B29C; B29C43/00; B29C43/02; B29L; B29L2017/00; B29L2017/001; B29L2017/003; Y; Y10; Y10S; Y10S425/00; Y10S425/81
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3000057A
Cited
US3143198A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-06-25 | 1971-12-25 | 1972-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-06-25 | 1975-12-25 | 1976-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-06-25 | 1979-12-25 | 1980-06-25 | $7700.00 | Window Closed / Lapsed |