Patent US3534134A successfully refreshed from Google Patents.
US3534134A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of eliminating curvature from bowed or warped foamed polyvinyl chloride sheets
Assignee: Johns Manville Corp
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Filing: 1968-07-02
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Granted: 1970-10-13
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Expires: 1988-07-02
Abstract
No abstract record available.
Inventors
- 👤 Linden Hannan Mathews
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:42
CPC Classifications
B; B29; B29C; B29C53/00; B29C53/16; B29C53/18; B29C44/00; B29C44/34; B29C44/56; B29C44/5627; B29C44/5636; B29K; B29K2105/00; B29K2105/04
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) | 1973-10-12 | 1974-04-13 | 1974-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-10-12 | 1978-04-13 | 1978-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-10-12 | 1982-04-13 | 1982-10-13 | $7700.00 | Window Closed / Lapsed |