Patent US5089738A successfully refreshed from Google Patents.
US2867149A
Expired / Lapsed
US
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Method of determining surface flatness
Assignee: AT&T Inc
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Filing: 1953-10-05
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Granted: 1959-01-06
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Expires: 1973-10-05
Abstract
No abstract record available.
Inventors
- 👤 Charles T Goddard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 08:55
CPC Classifications
G; G01; G01B; G01B11/00; G01B11/30; G01B11/306; G01D; G01D5/00; G01D5/26; G01D5/32; G01D5/34; G01D5/36; G01D5/38
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1590532A
Cited
US1906803A
Cited
GB395649A
Cited
US2247047A
Cited
US2253054A
Cited
US2379263A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-01-05 | 1962-07-07 | 1963-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-01-05 | 1966-07-07 | 1967-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-01-05 | 1970-07-07 | 1971-01-06 | $7700.00 | Window Closed / Lapsed |