Patent US3259480A successfully refreshed from Google Patents.
US3259480A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of removing surface defects from glass sheets
Assignee: PPG Industries Inc
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Filing: 1962-12-17
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Granted: 1966-07-05
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Expires: 1982-12-17
Abstract
No abstract record available.
Inventors
- 👤 Edmund R Michalik
- 👤 George W Misson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 23:08
CPC Classifications
C; C03; C03B; C03B29/00; C03B29/04; C03B29/06; C03B29/08; C03B29/12; C03B35/00; C03B35/14; C03B35/22; C03B35/24; C03B35/246
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
77 words
A METHOD OF REMOVING SURFACE DEFECTS FROM GLASS SHEET WHICH COMPRISES, EXPOSING ONE SURFACE OF THE GLASS TO AN ELEVATED TEMPERATURE AT WHICH THE GLASS FLOWS AND FOR A SUFFICIENT TIME THAT THE SURFACE FLOWS AN SIMULTANEOUSLY EXPOSING THE OTHER SURFACE OF THE GLASS TO A TEMPERATURE BELOW THAT AT WHICH THE GLASS FLOWS AND MAINTAINING THE TEMPERATURE OF SAID OTHER SURFACE BELOW THAT AT WHICH IT FLOWS AND ABOVE THE STRAIN POINT TEMPERATURE OF THE GLASS.
Claim 2
Independent Claim
77 words
A METHOD OF REMOVING SURFACE DEFECTS FROM GLASS SHEET WHICH COMPRISES, EXPOSING ONE SURFACE OF THE GLASS TO AN ELEVATED TEMPERATURE AT WHICH THE GLASS FLOWS AND FOR A SUFFICIENT TIME THAT THE SURFACE FLOWS AN SIMULTANEOUSLY EXPOSING THE OTHER SURFACE OF THE GLASS TO A TEMPERATURE BELOW THAT AT WHICH THE GLASS FLOWS AND MAINTAINING THE TEMPERATURE OF SAID OTHER SURFACE BELOW THAT AT WHICH IT FLOWS AND ABOVE THE STRAIN POINT TEMPERATURE OF THE GLASS.
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) | 1969-07-04 | 1970-01-03 | 1970-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-07-04 | 1974-01-03 | 1974-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-07-04 | 1978-01-03 | 1978-07-05 | $7700.00 | Window Closed / Lapsed |