US3520608A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Testing toughened glass for internal stresses
Assignee: Pilkington Automotive Ltd
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Filing: 1967-09-12
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Granted: 1970-07-14
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Expires: 1987-09-12
Abstract
No abstract record available.
Inventors
- 👤 Henry B Spencer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:48
CPC Classifications
G; G01; G01B; G01B11/00; G01B11/16; G01B11/18; G01L; G01L1/00; G01L1/24; G01L1/241; G01N; G01N21/00; G01N21/17; G01N21/21
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) | 1973-07-13 | 1974-01-12 | 1974-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-13 | 1978-01-12 | 1978-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-13 | 1982-01-12 | 1982-07-14 | $7700.00 | Window Closed / Lapsed |