US2991591A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of prestressing glass articles
Assignee: National Research Development Corp UK
•
Filing: 1957-10-02
•
Granted: 1961-07-11
•
Expires: 1977-10-02
Abstract
No abstract record available.
Inventors
- 👤 Gabor Dennis
- 👤 Kalman Peter Gabor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:26
CPC Classifications
C; C03; C03B; C03B27/00; C03B27/04; C03B27/06; C03B27/065
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2177336A
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US2254227A
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GB536858A
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US2290763A
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US2462988A
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GB704312A
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GB726626A
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GB763267A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-10 | 1965-01-09 | 1965-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-10 | 1969-01-09 | 1969-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-10 | 1973-01-09 | 1973-07-11 | $7700.00 | Window Closed / Lapsed |