Patent US3522067A successfully refreshed from Google Patents.
US3522067A
Expired / Lapsed
US
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Method for preparation of insulation panels of expanded perlite particles
Assignee: Central Manufacturing District
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Filing: 1967-06-12
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Granted: 1970-07-28
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Expires: 1987-06-12
Abstract
No abstract record available.
Inventors
- 👤 Roger A Macarthur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:44
CPC Classifications
C; C04; C04B; C04B20/00; C04B20/10; C04B20/1055; C04B28/00; C04B28/24; C04B28/26
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2481390A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-07-27 | 1974-01-26 | 1974-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-27 | 1978-01-26 | 1978-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-27 | 1982-01-26 | 1982-07-28 | $7700.00 | Window Closed / Lapsed |