Patent US3710516A successfully refreshed from Google Patents.
US3710516A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of drilling glass
Assignee: PPG Industries Inc
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Filing: 1971-02-19
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Granted: 1973-01-16
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Expires: 1991-02-19
Abstract
Abstract A method of drilling holes in glass wherein a drill is rotated at a speed between about 3,400 rpm and about 3,600 rpm and advanced into a glass work piece at a constant forward rate of speed.
Inventors
- 👤 J Kelly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:14
CPC Classifications
B; B28; B28D; B28D1/00; B28D1/02; B28D1/04; B28D1/041
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
74 words
A method of drilling a glass work piece which comprises rotating a drill at a speed suitable for drilling glass, and advancing the drill into said glass at a constant rate of speed, said drill being advanced by a force which is greater than that necessary to advance said drill, but which is checked so that only the force necessary to advance said drill at a given constant rate of speed is applied thereto.
Claim 2
Independent Claim
74 words
A method of drilling a glass work piece which comprises rotating a drill at a speed suitable for drilling glass, and advancing the drill into said glass at a constant rate of speed, said drill being advanced by a force which is greater than that necessary to advance said drill, but which is checked so that only the force necessary to advance said drill at a given constant rate of speed is applied thereto.
Claim 3
Dependent Claim
97 words
In a method of drilling a glass work piece the method comprising the steps of: a. positioning a glass work piece adjacent a drill; b. rotating said drill at a speed suitable for drilling glass; and c. advancing said drill into the surface of said glass work piece at a constant forward rate of speed, said drill being advanced by a force which is greater than that which is necessary to advance said drill, but which is checked so that only the force necessary to advance said drill at said constant rate of speed is applied thereto.
Claim 4
Dependent Claim
97 words
In a method of drilling a glass work piece the method comprising the steps of: a. positioning a glass work piece adjacent a drill; b. rotating said drill at a speed suitable for drilling glass; and c. advancing said drill into the surface of said glass work piece at a constant forward rate of speed, said drill being advanced by a force which is greater than that which is necessary to advance said drill, but which is checked so that only the force necessary to advance said drill at said constant rate of speed is applied thereto.
Claim 5
Independent Claim
90 words
A method of drilling glass wherein the drill is advanced into the glass at a constant rate of speed of about 0.055 inches per second while the drill is rotating at about between 3,400 revolutions per minute and 3,600 revolutions per minute, said drill being advanced by a force which is greater than that which is necessary to advance said drill, but which is checked so that only the force necessary to advance said drill at said constant rate of speed of about 0.055 inches per second is applied thereto.
Claim 6
Independent Claim
90 words
A method of drilling glass wherein the drill is advanced into the glass at a constant rate of speed of about 0.055 inches per second while the drill is rotating at about between 3,400 revolutions per minute and 3,600 revolutions per minute, said drill being advanced by a force which is greater than that which is necessary to advance said drill, but which is checked so that only the force necessary to advance said drill at said constant rate of speed of about 0.055 inches per second is applied thereto.
Claim 7
Independent Claim
124 words
A method of drilling a hole in a glass work piece which comprises: a. rotating a first drill at a speed suitable for drilling a hole in glass; b. rotating a second drill at a speed suitable for drilling a hole in glass; and c. advancing said first and second drills into the glass work piece from opposite sides at a constant rate of speed, each of said drills advancing at least to the approximate midpoint of said work piece, each of said drills being advanced by a force which is greater than that which is necessary to advance said drills but which is checked so that only the force necessary to advance said drills at said constant rate of speed is applied thereto.
Claim 8
Independent Claim
124 words
A method of drilling a hole in a glass work piece which comprises: a. rotating a first drill at a speed suitable for drilling a hole in glass; b. rotating a second drill at a speed suitable for drilling a hole in glass; and c. advancing said first and second drills into the glass work piece from opposite sides at a constant rate of speed, each of said drills advancing at least to the approximate midpoint of said work piece, each of said drills being advanced by a force which is greater than that which is necessary to advance said drills but which is checked so that only the force necessary to advance said drills at said constant rate of speed is applied thereto.
Claim 9
Independent Claim
121 words
A method of drilling a glass work piece comprising the steps of: a. positioning a glass work piece adjacent a drill; b. rotating said drill at a speed suitable for drilling glass; and c. advancing said drill into a surface of said glass work piece at a forward rate of speed that is independent of the sharpness of the drill, the resistive forces of the glass, and the frictional forces in a drilling apparatus which is advancing said drill, said drill being advanced by a force which is greater than that which is necessary to advance said drill, but which is checked so that only the force necessary to advance said drill at said constant rate of speed is applied thereto.
Claim 10
Independent Claim
121 words
A method of drilling a glass work piece comprising the steps of: a. positioning a glass work piece adjacent a drill; b. rotating said drill at a speed suitable for drilling glass; and c. advancing said drill into a surface of said glass work piece at a forward rate of speed that is independent of the sharpness of the drill, the resistive forces of the glass, and the frictional forces in a drilling apparatus which is advancing said drill, said drill being advanced by a force which is greater than that which is necessary to advance said drill, but which is checked so that only the force necessary to advance said drill at said constant rate of speed is applied thereto.
Claim 11
Independent Claim
163 words
A method of drilling a glass work piece which comprises the steps of: a. positioning a glass work piece adjacent a drill; b. rotating said drill at a speed suitable for drilling glass; and c. advancing said drill into a surface of said glass work piece in such a manner that the depth of penetration of the drill bit into said glass work piece is determined by the rate of advance of said drill bit, the speed or roTation of said drill bit, and the grit size of diamonds in said drill bit, and is independent of the sharpness of the drill bit, the resistance of the glass work piece, and the frictional forces in the apparatus advancing the drill bit, said drill being advanced by a force which is greater than that which is necessary to advance said drill, but which is checked so that only the force necessary to advance said drill at said constant rate of feed is applied thereto.
Claim 12
Independent Claim
163 words
A method of drilling a glass work piece which comprises the steps of: a. positioning a glass work piece adjacent a drill; b. rotating said drill at a speed suitable for drilling glass; and c. advancing said drill into a surface of said glass work piece in such a manner that the depth of penetration of the drill bit into said glass work piece is determined by the rate of advance of said drill bit, the speed or roTation of said drill bit, and the grit size of diamonds in said drill bit, and is independent of the sharpness of the drill bit, the resistance of the glass work piece, and the frictional forces in the apparatus advancing the drill bit, said drill being advanced by a force which is greater than that which is necessary to advance said drill, but which is checked so that only the force necessary to advance said drill at said constant rate of feed is applied thereto.
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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) | 1976-01-16 | 1976-07-17 | 1977-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-16 | 1980-07-17 | 1981-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-16 | 1984-07-17 | 1985-01-16 | $7700.00 | Window Closed / Lapsed |