US3258972A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of strengthening delivery points and stems of laboratory glassware
Assignee: OI Glass Inc
•
Filing: 1963-11-01
•
Granted: 1966-07-05
•
Expires: 1983-11-01
Abstract
No abstract record available.
Inventors
- 👤 Howard L Cassaday
- 👤 Orman F House
- 👤 James F Ryley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:21
CPC Classifications
C; C03; C03B; C03B27/00; C03B27/04; C03B27/06; C03B27/065; B; B01; B01L; B01L3/00; B01L3/02; B01L3/021
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
47 words
AS AN ARTICLE OF MANUFACTURE, A GLASS PIPETTE HAVING THE TAPERED DELIVERY END PORTION FORMED WITH A COMPRESSIVE STRESS IN THE OUTER SURFACE CORRESPONDING TO A MAXIMUM, TOTAL, OPTICAL RETARDATION READING OF FROM 100 MU TO 250MU AND HAVING A COMPENSATING TENSILE STRESS IN THE INSIDE SURFACE.
Claim 2
Dependent Claim
47 words
AS AN ARTICLE OF MANUFACTURE, A GLASS PIPETTE HAVING THE TAPERED DELIVERY END PORTION FORMED WITH A COMPRESSIVE STRESS IN THE OUTER SURFACE CORRESPONDING TO A MAXIMUM, TOTAL, OPTICAL RETARDATION READING OF FROM 100 MU TO 250MU AND HAVING A COMPENSATING TENSILE STRESS IN THE INSIDE SURFACE.
References Cited (Backward Citations)
US2329057A
Cited
US2692503A
Cited
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 |